Chapter 1
Foundations of Sports Nutrition

Introduction to Sports Nutrition

Learning goal: Understand what sports nutrition is, who needs it, and how it differs from general nutrition.

Bridge in: Volume 4 taught you how to build muscle and strength through nutrition. Now we zoom out to the full athlete—runners, swimmers, cricketers, powerlifters, kabaddi players—and see how nutrition shapes their performance.

1What is sports nutrition?

Sports nutrition is the science of eating to improve athletic performance. Not just to be healthy. Not just to build muscle. But specifically: to run faster, recover quicker between matches, sustain effort longer, hit harder, and adapt to training so you improve week by week.

A healthy diet and a sports nutrition plan are not the same thing. A civil servant in Chennai can eat dal, rice, curd, and vegetables every day and be perfectly healthy. But a state-level cricketer cannot. The cricketer trains twice a day, sweats for hours in the heat, plays matches every week, and needs their food to work with that stress—to fuel it, recover from it, and build from it.

That is sports nutrition.

2Why athletes need different nutrition

Your body adapts to the stresses you place on it. A runner does 10 km a day—the heart adapts, capillaries grow, aerobic enzymes multiply. A weightlifter squats heavy—muscle fibres break, then rebuild stronger. A kabaddi player sprints and stops 50 times per match—the nervous system learns explosive recruitment.

Nutrition either supports these adaptations or it doesn't. If a runner eats 1800 calories a day but burns 2500 training, they underrecovery. If a weightlifter eats 100 grams of protein but needs 150, their muscles don't rebuild. If a cricketer doesn't refuel during a 5-hour match, their blood sugar crashes and they cannot concentrate.

Sports nutrition is the precise matching of food to training stress.

3Who needs sports nutrition?

You do if you:

• Train more than 5 hours per week
• Play competitive sport
• Are pursuing a personal best (running a marathon, lifting a PR, preparing for selection trials)
• Are a young athlete developing your sport
• Train twice a day
• Need to recover between high-intensity efforts

A casual gym-goer 3 times a week? Probably not—general nutrition, good sleep, and consistency beat any sports nutrition trick. But a state-level athlete, a university squad player, or anyone chasing improvement in sport? Yes.

4The athlete versus the weekend jogger

Consider Raj, a 28-year-old distance runner from Delhi, training for a national marathon. He runs 70–80 km per week, including two hard sessions (tempo runs and intervals) and a long run. His body composition, VO2 max, lactate threshold, aerobic metabolism—all are specifically adapted to distance running.

Now consider Anil, his cousin, who jogs 15 km per week for fitness. Both eat rice, dal, and vegetables. But Raj needs:

• Higher total calories (training burns 1500–2000 per week)
• Timed carbohydrates (to preserve glycogen and fuel speed work)
• Careful iron (distance runners lose more iron than sedentary people)
• Intra-race fueling (he’ll bonk without carbs during the marathon)

Anil just needs to not overeat and move. Raj needs sports nutrition.

5Performance, recovery, body composition, and health

Sports nutrition balances four goals:

The best sports nutrition plan balances all four. A sprinter who eats loads to build muscle but loses speed is imbalanced. A distance runner who cuts calories so hard they develop amenorrhoea and anemia is imbalanced. A footballer who gets stronger but develops tendonitis is imbalanced.

6Why India needs sports nutrition knowledge

Sports nutrition is young in India. Many athletes still follow folk wisdom: “Eat ghee and milk,” or “Protein comes only from eggs and chicken,” or “Carbs make you slow.” Most coaches focus on training; few understand that nutrition might be 30–40% of the adaptation.

But India has:

• World-class cricketers, kabaddi players, wrestlers, badminton players, and distance runners
• A huge fitness and sports training industry growing
• Many indigenous high-protein foods (dal, paneer, curd, mil, ragi, chickpeas) that are cheap and powerful
• A climate (heat, humidity, high sweat rates) that demands specific hydration science

In the next 12 chapters, you will learn to design nutrition plans for Indian athletes using Indian foods, Indian training conditions, and Indian competition schedules.

Key Takeaways:

• Sports nutrition is nutrition to improve performance, not just health.
• Athletes adapt to training; nutrition supports or hinders that adaptation.
• It balances performance, recovery, body composition, and health.
• India has world-class athletes and affordable high-protein foods—the missing piece is knowledge.

Next: In 1.2, we’ll map how the body produces energy during exercise—the three energy systems that power all athletic movement.

Energy Systems in Human Performance

Learning goal: Understand the three energy systems, when each dominates, and why nutrition must match the energy system.

Bridge in: Nutrition fuels the body. But the body doesn’t use one fuel source—it has three different engines, each suited to different demands. To feed an athlete properly, you must know which engine is running.

1The three energy systems

Your muscle cells produce energy (ATP) in three ways. Think of them as three gears in a car—each suited to a different demand.

2System 1: The ATP-PC (phosphocreatine) system

ATP-PC is the immediate, explosive gear. When you need maximum power right now—a 100-metre sprint, a weightlifting max attempt, a kabaddi raider’s explosive cut—this system fires first.

It lasts about 10 seconds and gives you pure power, no lactate, no fatigue signal. It uses creatine phosphate (stored in muscle) to rapidly rebuild ATP. Once it’s depleted (in ~10–15 seconds of maximal effort), you must switch gears.

Nutrition for ATP-PC: Creatine loading increases the stored pool. Quick carbs during warm-up help refuel it between efforts.

3System 2: Anaerobic glycolysis

Anaerobic glycolysis is the acceleration lane. It kicks in during efforts lasting 30 seconds to 3 minutes—a 400-metre run, intense strength sets, a cricket ball chase, repeated kabaddi raids.

It uses muscle glycogen (carbohydrates stored in muscle) to produce ATP very quickly, but it produces lactate as a byproduct. Lactate builds up, muscle pH drops, and fatigue sets in. You can only sustain it for a few minutes.

Nutrition for anaerobic glycolysis: Carbohydrates replenish muscle glycogen. Sodium and potassium help buffer lactate. Training teaches the muscle to tolerate lactate better.

4System 3: Aerobic oxidation

Aerobic oxidation is the cruise lane. It dominates efforts lasting more than 3 minutes—a half-marathon, cycling, continuous cricket fielding, endurance training. It uses carbohydrates, fat, and some protein to produce ATP slowly but sustainably, with virtually no lactate.

It is fuel-efficient and produces far more ATP per unit of fuel than the other systems. It can run for hours. Most sport is aerobic, even if it feels intense.

Nutrition for aerobic exercise: Carbohydrates, fat, and hydration all matter. During long efforts (over 2 hours), athletes must refuel with carbs and electrolytes.

5Real athletes use all three, not one

A cricketer batting: starts with ATP-PC for the initial foot movement and stroke power (1–2 seconds per ball), switches to anaerobic glycolysis during quick singles and fielding sprints (5–30 seconds), and runs on aerobic power during long overs in the field (continuous, 3+ minutes). A single match uses all three.

A powerlifter training: uses ATP-PC for the attempt itself (2–5 seconds), rests while anaerobic glycolysis recovers (3–5 minutes), and maintains aerobic fitness with conditioning work.

A distance runner: runs mostly aerobic (race pace is sustainable for hours) but can recruit anaerobic glycolysis during a final kick (last 400 metres of a 5-km race).

6Why this matters for sports nutrition

If you coach a 400-metre runner, they need aerobic base endurance (run aerobic 5 days a week), but their competition is 45–60 seconds of hard anaerobic glycolysis. Their nutrition must build muscle glycogen stores and teach their body to handle lactate. Carbs are essential; endurance-style fasting workouts would backfire.

If you coach a marathon runner, most training is aerobic (3+ hours easy), with brief anaerobic sessions (intervals). Their nutrition must balance long, steady fat utilization with carb-loading before the race.

If you coach a sprinter, most training is ATP-PC and anaerobic intervals, with aerobic warm-ups. Their nutrition can be leaner in carbs during training weeks, but carbs still matter for glycogen repletion and training adaptation.

Mismatch nutrition to the energy system, and you underperform.

Key Takeaways:

• The body has three energy systems: ATP-PC (0–15 seconds), anaerobic glycolysis (30 seconds–3 minutes), and aerobic oxidation (3+ minutes).
• Each system uses different fuel (creatine, glycogen, carbs/fat/protein) and has different nutritional demands.
• Most sports use all three systems during competition or training.
• Sports nutrition must match the energy system demands of the sport.

Next: In 1.3, we explore energy availability—a critical concept that determines whether an athlete adapts to training or breaks down.

Energy Availability in Athletes

Learning goal: Understand energy availability (EA), relative energy deficiency in sport (RED-S), and why calories matter as much as macronutrients.

Bridge in: You now know the three energy systems. But all three require sufficient energy (calories) to function. Too much training, too few calories, and the athlete enters a dangerous state: relative energy deficiency.

1What is energy availability?

Energy availability (EA) is the amount of dietary energy (calories) available to fuel all body functions after subtracting the energy burned during exercise.

Formula: EA = (total calories eaten – exercise energy expenditure) / lean body mass (kg)

Example: Priya, a 65-kg female runner with 55 kg lean mass, eats 2200 calories and burns 800 calories running.

EA = (2200 – 800) / 55 = 1400 / 55 = 25.5 kcal per kg lean mass.

That is adequate energy availability. She has 25.5 calories per kg available for basal metabolism, hormones, immune function, and recovery.

2The RED-S threshold

Below 30 kcal per kg lean mass, the body enters a state called relative energy deficiency in sport (RED-S). At this point, hormones drop, bone density falls, immune function crashes, and adaptation to training stalls.

If Priya dropped to 1500 calories while maintaining 800 exercise burn, she would be:

EA = (1500 – 800) / 55 = 12.7 kcal per kg—well below the RED-S threshold. She would immediately show:

• Missed or irregular periods (loss of menstrual regularity)
• Declining bone density
• Frequent infections (low immunity)
• Slow recovery between workouts
• Plateauing performance despite hard training
• Mood disturbances, low energy, poor focus

3Energy availability and adaptation

Training stress triggers adaptation. But the body only adapts when it has energy surplus. If you train hard but starve, the body goes into conservation mode: it shuts down non-essential systems (reproduction, bone remodeling, immune antibody production) to preserve energy for immediate survival.

You cannot build muscle, improve bone, or develop aerobic fitness on a deficit.

4The two forms: absolute and relative

Absolute energy deficiency: You eat less than you burn. A runner eats 1800 calories and burns 2500 training. Deficit of 700 calories daily.

Relative energy deficiency: You eat plenty, but training is so high that EA drops below 30 per kg. A 70-kg runner who burns 2000 calories training but eats 3500 daily still has low EA if lean mass is low (say, 58 kg): EA = (3500 – 2000) / 58 = 25.9 kcal per kg.

Both trigger RED-S. Both damage performance and health.

5Why coaches miss this

A coach sees a thin, fast runner and assumes the leanness is fitness. But thinness + low EA = hormonal suppression, not adaptation. The runner might seem to perform well for a few months, then injuries spike (weak bones), or they get sick every other week, or their periods disappear. Only then does someone ask, “How much are you eating?”

The answer is often: not enough.

6Calculating and monitoring EA

As a coach or athlete, you can estimate EA:

1. Count daily calories eaten (food diary, app, or rough estimate).
2. Estimate exercise energy burn (watch, metabolic calculation, or training log).
3. Estimate lean body mass (DEXA, BodPod, or simple weight – estimated fat %).
4. Calculate: (calories in – exercise burn) / lean kg.

If the result is below 30, the athlete is in RED-S. Action: increase calories, reduce training, or both.

Key Takeaways:

• Energy availability (EA) is calories available after subtracting exercise burn.
• Below 30 kcal per kg lean mass, RED-S occurs: hormones drop, bones weaken, immunity crashes.
• You cannot adapt to hard training on a deficit; the body goes into conservation mode.
• Both absolute and relative deficiency trigger RED-S.
• Calculate and monitor EA to ensure athletes have enough energy to adapt.

Next: In 1.4, we explore how training stress triggers adaptation and why nutrition is the enabling mechanism.

Training Adaptation Through Nutrition

Learning goal: Understand the adaptation cycle: how training stress triggers the body to change, and how nutrition enables that change.

Bridge in: You now know energy must be available for the body to adapt. But how does that adaptation actually happen? What is the mechanism, and where does nutrition fit?

1The training adaptation cycle

Training works through a cycle:

1. Stimulus: You run hard, lift heavy, or repeat an intense effort. This creates mechanical stress, metabolic stress, and micro-damage in the muscle.
2. Recovery: The body senses the stress and activates repair. Protein synthesis increases. Glycogen is refilled. Hormones (growth hormone, testosterone, IGF-1) rise. Immune cells clean up damage.
3. Adaptation: The muscle rebuilds stronger, the aerobic system builds more capillaries, the nervous system learns the movement pattern. You are now better equipped for that stress next time.
4. Repeat: You apply the same stress again. Because you adapted, you handle it better—slightly more volume, slightly more intensity. The cycle repeats.

This is periodization, but it only works if step 2 (recovery) is complete. Skip recovery—shortcut sleep, skip refueling, ignore soreness—and adaptation stalls. You just get injured and tired.

2Nutrition’s role in each phase

Stimulus (the workout): Nutrition before and during the workout determines performance in that workout. Good pre-workout fuel means you can lift heavier, run faster, or sustain longer. Poor fueling means weakness and underperformance.

Recovery (post-workout and the hours after): Nutrition is central. Protein rebuilds muscle. Carbs refill glycogen. Micronutrients enable enzymes. Hydration restores water lost in sweat. Without these, recovery is slow and adaptation is blunted.

Adaptation (the next 24–72 hours): Enough overall calories allow anabolism (building). Protein allows muscle synthesis. Micronutrients enable hormone production. Sleep allows growth hormone release. Miss any one, and adaptation stalls.

Repeat (next training session): Adequate energy, macros, and micronutrients allow the athlete to show up for the next session ready to perform.

3Two adaptations: aerobic and anaerobic

Aerobic adaptation (endurance training): The heart gets stronger (cardiac output increases). Capillaries grow (more oxygen delivery). Mitochondria multiply (more aerobic enzymes). Red blood cells increase (more oxygen carrying). The result: you can run farther or faster at the same heart rate.

Nutrition for aerobic adaptation: high carbohydrate intake (to fuel the training and replenish glycogen for adaptations), adequate protein (to support capillary and mitochondrial growth), and overall calorie surplus or balance (never deficit). Iron is also critical (it is part of haemoglobin and aerobic enzymes).

Anaerobic and strength adaptation (resistance training): Muscle fibres enlarge (hypertrophy). Neuromuscular coordination improves (you learn to recruit muscle better). Tendon and bone get stronger. The result: you can lift heavier or move more explosively.

Nutrition for anaerobic adaptation: high protein intake (to rebuild muscle, 1.6–2.2 g per kg). Carbohydrate (to fuel the training and refill glycogen). Calorie surplus (excess energy is partitioned to muscle growth). Creatine and zinc support muscle protein synthesis.

4The concept of overreaching and overtraining

If you repeatedly train hard without adequate recovery nutrition (calories, carbs, protein, sleep), you enter overreaching (a state of accumulated fatigue and blunted adaptation). If overreaching continues for weeks, you reach overtraining syndrome (a clinical state of hormonal and neural breakdown: low testosterone, elevated cortisol, high resting heart rate, depression, frequent illness).

Prevention: match training stress with recovery nutrition. If a runner increases weekly mileage by 30% but cuts calories from 2500 to 2100, they will overstrain. If a lifter adds a third gym session but doesn’t increase protein from 100 g to 140 g, they will overreach.

Nutrition is prevention.

5Periodization: matching nutrition to training phase

Smart coaches change training across the year. Off-season: build general fitness, maybe gain muscle. Pre-competition: sharpen speed and power. Competition: maintain fitness, focus on recovery. Post-season: deload and rebuild.

Nutrition changes with each phase:

• Off-season: High calories, high carbs, high protein. Build muscle and glycogen stores.
• Pre-competition (build phase): Moderate-to-high calories, high carbs for training intensity, high protein for neuromuscular development.
• Competition: Maintain calories (avoid deficit that would weaken performance), high carbs (for match/event energy), adequate protein (for recovery between matches), and strategic hydration (especially in hot climates).
• Post-season: Can go slightly lower in calories (deload week), but still maintain protein (retain muscle), and focus on micronutrients and recovery.

6Individual variation in adaptation

Some athletes adapt quickly to training; others slowly. Genetics matter (muscle fiber type, hormone profiles, mitochondrial density). But so does nutrition compliance. An athlete who eats consistently 1.8 g protein per kg throughout the year will adapt to resistance training faster than one who only hits 1.2 g on some days.

Key Takeaways:

• Adaptation works through a cycle: stimulus, recovery, adaptation, repeat.
• Nutrition enables recovery; without it, adaptation stalls.
• Different training types (aerobic, anaerobic, strength) have different nutritional needs.
• Overtraining results from repeated high training stress without adequate recovery nutrition.
• Periodization pairs training cycles with nutrition cycles.

Next: In 1.5, we explore a critical distinction: sports nutrition is not the same as health nutrition. They have different goals and different rules.

Performance vs Health Nutrition

Learning goal: Understand the differences between performance nutrition and health nutrition, and when each applies.

Bridge in: You now understand training adaptation and energy availability. But here is a critical question: is the optimal diet for athletic performance the same as the optimal diet for health?

1Health nutrition vs performance nutrition

Health nutrition: Optimal diet for longevity, disease prevention, and wellbeing. Focus: minimize processed foods, maximize vegetables and whole grains, moderate all macros, adequate micronutrients. A healthy person eats this way to stay healthy into old age.

Performance nutrition: Optimal diet for athletic performance. Focus: match fuel to training demand, time nutrients for adaptation, manipulate body composition for sport, optimize recovery between efforts. An athlete eats this way to go faster, lift heavier, or compete better right now.

They are not the same. In fact, they sometimes conflict.

2Three key differences

1. Calorie targets:

Health nutrition: balance calories to stay at a healthy weight. Generally, don’t overeat.

Performance nutrition: match calories to training demand. An endurance athlete in heavy training needs a surplus; a combat athlete cutting weight needs a deficit; a strength athlete bulking needs a calorie surplus.

2. Carbohydrate intake:

Health nutrition: moderate carbs (no more than 45–65% of calories). Focus on whole grains and fiber.

Performance nutrition: can be very high (60–70% of calories) during heavy aerobic training. Even refined carbs (sports drinks, gels, white rice) are justified during competition because absorption speed matters.

3. Nutrient timing:

Health nutrition: timing doesn’t matter much. Eat three meals a day; nutrient distribution is mild.

Performance nutrition: timing is critical. Carbs 30–60 minutes before a hard session to preserve glycogen. Protein + carbs within 30–60 minutes post-workout to trigger muscle synthesis. Different distribution for different sessions.

3Long-term performance vs longevity

A competitive athlete during their peak years (18–35) might optimize for performance: high calories, high carbs, sodium-loaded pre-competition meals, minimal whole grains if refined carbs train better. This works short-term.

But if that athlete never shifts back to a health-focused diet (after retirement, or in the off-season), long-term health suffers. Inflammation can build. Bone density might decline (if energy was too low). Cardiovascular health might not get attention. Micronutrient gaps might exist.

Best practice: during competition season, optimize for performance. In off-season, shift toward health nutrition—more vegetables, more whole grains, more micronutrients. This balances winning now with health later.

4Performance nutrition is individual

Two distance runners of the same body weight, same VO2 max, same 5-km time might have different optimal nutrition because they have different gut health, different carbohydrate sensitivity, different sweat electrolyte loss, and different training schedules.

Runner A: Trains early morning (fasted runs work better for her aerobic metabolism). Eats low-fiber diet (she has sensitive gut). Best race-day fuel: simple carbs + electrolytes.

Runner B: Trains afternoon (he needs pre-workout fuel). Eats high-fiber diet (strong gut). Best race-day fuel: oats + banana + coconut water.

Both are correct for them. A coach who gives them the same nutrition plan will fail for one of them.

5When to prioritize health over performance

If an athlete shows signs of RED-S, eating disorder, or hormonal dysfunction, the priority flips: restore health first, worry about performance later. A female runner with amenorrhoea needs energy restoration, not carb-loading for races. A weightlifter with stress fractures needs recovery nutrition, not high training volume.

Health is the floor. Performance is built on top of it.

Key Takeaways:

• Performance nutrition and health nutrition have different goals and sometimes conflict.
• Performance nutrition is time-sensitive, calorie-matched to training, and individual.
• Health nutrition prioritizes long-term disease prevention and micronutrient density.
• Athletes should prioritize performance during competition, shift to health during off-season.
• If an athlete shows health problems (amenorrhoea, stress fractures, low immunity), health takes priority over performance.

Next: In 1.6, we dive into how the body selects and uses fuel during exercise—the mechanics of aerobic and anaerobic fuel utilization.

Fuel Utilization During Exercise

Learning goal: Understand how the body chooses between carbohydrates and fat during exercise, and how training, fitness, and nutrition change that choice.

Bridge in: You now know three energy systems and the importance of energy availability. But here is a practical question: during a run or match, is the body burning carbs or fat? And does it matter?

1Substrate utilization: carbs vs fat

At any moment during exercise, your muscles are burning a mix of carbohydrates (glucose and muscle glycogen) and fat (fatty acids from stored triglycerides and dietary fat). The ratio depends on:

• Exercise intensity
• Fitness level (aerobic adaptation)
• Fed vs fasted state
• Training history (adaptation to fat burning)
• Previous meals (carb availability)

2Intensity drives substrate choice

At low intensity (60% VO2 max or less, i.e., easy conversational pace), the body burns mostly fat. The aerobic system is efficient and can fully oxidize fat to ATP without lactate.

As intensity rises (70% VO2 max), carbohydrate use increases. At 80% VO2 max, carbs dominate. At 90%+ VO2 max, almost 100% carbs.

Why? Fat oxidation is slow. Each molecule of fat yields many ATP molecules, but it takes time to extract them. At high intensity, the muscle needs ATP fast. Carbs are rapid: one glucose molecule yields ATP in seconds. At high intensity, only carbs can keep up.

3Fitness changes substrate utilization

An unfit person running at 70% VO2 max burns mostly carbs (already at or near anaerobic threshold). A trained endurance athlete running at 70% VO2 max burns mostly fat (still well below threshold).

Why? Training increases mitochondrial density and aerobic enzymes. Capillary density improves oxygen delivery to fat-burning machinery. The aerobic system becomes more efficient at fat oxidation, even at moderate intensities.

This is why aerobic training is called “fat adaptation.” The body learns to extract ATP from fat faster, so it doesn’t need to rely on carbs as much.

4Pre-exercise nutrition changes substrate choice

If you eat a carb-rich meal 2–3 hours before exercise, blood glucose stays high, and the body preferentially burns carbs (blood glucose is available and ready to use).

If you exercise fasted (no recent meal), blood glucose is lower, and the body is forced to rely more on fat (it is all that is available).

Some coaches advocate fasted training for “fat adaptation.” It works in the short term: the body does burn more fat per calorie burned. But there are trade-offs:

• Performance is lower (less carbs to fuel intensity)
• Protein breakdown increases (body cannibilizes amino acids for glucose)
• Recovery is slower (no carbs to refill glycogen immediately)

Best practice: for easy-paced endurance training, fasted workouts are okay (fat adaptation benefit). For hard training, pre-workout carbs are essential (performance and recovery).

5Endurance training teaches fat burning

If you consistently do long, slow distance (LSD) runs at 60–70% VO2 max, your aerobic system adapts. Mitochondria multiply. Capillaries grow. Aerobic enzymes increase. Over weeks, you can burn fat faster.

This teaches the body metabolic flexibility: the ability to switch between fat and carbs depending on demand. A flexible athlete can:

• Burn fat during easy days (preserving limited muscle glycogen)
• Burn carbs during hard days (going fast)
• Handle both fed and fasted states

An athlete without flexibility can only run fast when blood glucose is high; they bonk when carbs run out.

6The bonk: when carbs run out

During exercise longer than 90 minutes (a half-marathon, a cricket match, a long training session), muscle glycogen stores deplete. If no new carbs enter the body (via food or drink), blood glucose drops. The brain and working muscles starve for glucose. Performance crashes; you cannot maintain pace; it feels like running through treacle.

This is the bonk or hitting the wall.

Prevention: refuel during exercise. A marathon runner drinks sports drinks every 5–10 km. A cyclist eats gels or energy bars during long rides. A cricketer sips coconut water between overs.

Key Takeaways:

• Fuel choice depends on intensity: low intensity = fat; high intensity = carbs.
• Aerobic training increases fat-burning capacity through mitochondrial and capillary adaptation.
• Metabolic flexibility (ability to burn both fat and carbs) is a sign of fitness.
• Endurance training teaches the body to spare muscle glycogen by burning fat longer.
• Without carb refueling during efforts over 90 minutes, the bonk occurs.

Next: In 1.7, we introduce training periodization—the strategic variation of training across weeks and months—and how nutrition must follow suit.

Training Periodization and Nutrition

Learning goal: Understand periodization (strategic training cycles) and how nutrition changes across each cycle to optimize adaptation.

Bridge in: You now know training causes adaptation only if recovery nutrition is present. But training itself changes through the year: building phase, peak phase, competition, recovery. Nutrition must follow.

1What is periodization?

Periodization is the strategic variation of training stress across weeks, months, and years. Instead of doing the same workout every day, a smart coach designs cycles:

• Microcycle: One week of training. Typically 4–6 sessions of varying intensity.
• Mesocycle: 3–4 weeks. A training block with a specific focus (e.g., building strength, building aerobic capacity, peaking power).
• Macrocycle: 3–12 months. The full annual plan from off-season to competition and recovery.

2Common periodization models

Linear periodization (traditional):

• Month 1: High volume, moderate intensity (build aerobic base)
• Month 2: Moderate volume, higher intensity (build power)
• Month 3: Low volume, very high intensity (peak)
• Month 4: Very low volume, full recovery (deload)

Undulating periodization (modern):

• Weekly variation: Monday = strength, Wednesday = aerobic, Friday = power. Vary intensity and volume daily rather than over weeks.
• Allows recovery within the week while maintaining adaptation stimulus.
• Common in sports with frequent competition.

Block periodization:

• Specific focus per mesocycle: 4 weeks accumulation (high volume), 2 weeks intensification (lower volume, higher intensity), 1 week realization (peak competition).
• Used in Olympic weightlifting and combined sports.

3Four training phases and their nutrition

Phase 1: Off-season (build, 8–12 weeks)

Goal: Build general fitness, muscle mass, work capacity.

Training: High volume (5–6 sessions weekly), moderate intensity, all energy systems trained. A runner does long runs, tempo runs, and intervals. A lifter does heavy strength and hypertrophy work. A cricketer does fitness circuits, batting practice, and fielding.

Nutrition: High calories (5–15% surplus to build muscle), high carbs (60–70% of calories to fuel volume), high protein (1.8–2.2 g per kg for muscle growth), and all micronutrients. Sleep is priority. Recovery quality matters most.

Phase 2: Pre-competition (build sport-specific fitness, 6–8 weeks)

Goal: Build the specific energy systems and movements needed for competition. Increase intensity.

Training: Moderate volume (4–5 sessions weekly), high intensity (more hard sessions, fewer easy ones), sport-specific movements. A runner does speed work and race-pace runs. A lifter does competition-lift variations at high loads.

Nutrition: Moderate-to-high calories (slight surplus or maintenance), high carbs (to fuel intensity and train glycogen supercompensation), high protein (1.6–2.0 g per kg), and begin hydration/fueling practice (simulate race conditions).

Phase 3: Competition (maintain and peak, 4–12 weeks depending on sport)

Goal: Maintain fitness while competing. Prioritize recovery between efforts.

Training: Low-to-moderate volume (2–4 sessions weekly, mostly easy or maintenance), minimal hard training (because matches/races provide the intensity), high emphasis on recovery. A cricketer trains 2–3 days per week (easy batting, fielding practice) and plays matches. A cyclist competes weekends and does light spin sessions midweek.

Nutrition: Maintenance calories (avoid deficit that would undermine performance), high carbs (for match/race energy), high protein (for recovery between matches), strategic sodium (especially in heat), and consistent hydration. Fueling strategy is tested and refined in every competition.

Phase 4: Post-season recovery (deload and rebuild, 2–4 weeks)

Goal: Complete physical and mental recovery. Prepare for next macrocycle.

Training: Very low volume (1–2 sessions weekly), very low intensity (easy pace only, no hard efforts), focus on movement quality and injury prevention. Active recovery (easy walks, swimming, yoga).

Nutrition: Moderate-to-low calories (no surplus needed; focus on nutrient quality), adequate carbs and protein (maintain health, not build), high micronutrient density (vegetables, fruits, whole grains). Sleep and stress management are priorities. Use this time to eat “healthy” if performance nutrition is not in focus.

4Why nutrition changes with phases

High-volume training burns more calories and depletes muscle glycogen more; high calories and carbs are essential. Low-volume training burns fewer calories; excess carbs and calories would lead to fat gain. Competition requires immediate fuel and fast recovery; timing and carb quality matter. Recovery requires healing; micronutrients and sleep matter more than macros.

Feeding every phase the same way is a common mistake. It leads to either underrecovery (high volume, low calories = breakdown) or overfat gain (low volume, high calories = fat gain).

Key Takeaways:

• Periodization strategically varies training across weeks, months, and years.
• Four main phases: off-season (build), pre-competition (sharpen), competition (maintain), recovery (deload).
• Nutrition must match each phase: high calories in off-season, maintenance in competition, quality micronutrients in recovery.
• Mismatched nutrition (e.g., high surplus in competition) leads to fat gain and underperformance.

Next: In 1.8, we expand on how to specifically feed each training phase for maximum adaptation and minimum waste.

Nutrition Across Training Phases

Learning goal: Learn practical nutrition strategies for each training phase, with Indian food examples and calorie/macro targets.

Bridge in: You understand the four phases and why nutrition changes. Now we get concrete: exactly what and how much to eat in each phase.

1Off-season nutrition (building block)

Off-season runs 8–12 weeks post-competition and is your chance to build general fitness, muscle, and work capacity.

Calorie target: Surplus of 300–500 kcal daily (above maintenance). If maintenance is 2300, eat 2600–2800. This small surplus fuels muscle growth without excessive fat gain.

Macronutrient distribution:

• Carbs: 60–70% of total calories (to fuel high training volume and refill glycogen daily)
• Protein: 1.8–2.2 g per kg lean mass (to rebuild muscle after hard sessions)
• Fat: 20–25% (to support hormone production)

Indian foods for off-season:

• Carbs (base of every meal): White and brown rice, roti (4–5 per meal), dosa, idli, cornflakes, oats, millets (ragi, jowar), pasta, noodles
• Protein (add to every meal): Paneer (150–200 g daily), dal (1.5 cups cooked daily), eggs (2–3 daily), chicken or fish (100–150 g if non-vegetarian), curd (200–300 ml), Greek yogurt
• Fat: Ghee (1–1.5 tsp per meal), coconut oil, peanut butter, nuts (almonds, cashews)
• Vegetables & micronutrients: Spinach, tomatoes, onions, carrots, broccoli, bitter gourd (karela), bottle gourd (lauki)

Example off-season day (2600 calories):

• Breakfast (700 kcal): Oats (50 g) + banana + paneer (50 g) + honey (1 tbsp) + ghee (1 tsp)
• Mid-morning (300 kcal): Banana + peanut butter (2 tbsp)
• Lunch (800 kcal): 2 cups white rice + dal (1.5 cups) + paneer curry (150 g paneer) + ghee (1 tsp)
• Pre-workout (200 kcal): Dosa + chutney
• Post-workout (400 kcal): Banana + milk (300 ml) + honey
• Dinner (200 kcal): Roti (2) + egg curry (2 eggs) + vegetables

2Pre-competition nutrition (specific fitness)

Pre-competition runs 6–8 weeks and builds sport-specific fitness and power.

Calorie target: Maintenance or small surplus (100–200 kcal). Focus shifts from growth to performance. Training becomes more intense; volume drops.

Macronutrient distribution:

• Carbs: 60–70% (intensity increases; carbs fuel hard sessions)
• Protein: 1.6–2.0 g per kg (maintain muscle; less growth focus)
• Fat: 20–25%

Pre-competition specific strategies:

• Carb-load 2–3 days before major races (increase white rice, pasta, noodles 10–15%)
• Hydration practice: drink 500–750 ml coconut water or sports drink during long training sessions to practice fueling strategy
• Sodium increase: add pickled vegetables, salt tablets, or electrolyte drinks to replace sweat loss

Example pre-competition day (2400 calories):

• Breakfast (600 kcal): Dosa (3) + sambar + paneer (50 g)
• Mid-morning (250 kcal): Orange + cashews (30 g)
• Lunch (800 kcal): Rice (2 cups) + dal + fish curry (100 g fish) + vegetables
• Pre-workout (150 kcal): Banana
• During workout (100–200 kcal): Sports drink (500 ml) if session >90 minutes
• Post-workout (350 kcal): Paneer sandwich + milk (200 ml)
• Dinner (150 kcal): Roti (1.5) + dal + vegetables

3Competition nutrition (match day)

During competition (matches, races, events), the goal is optimal fueling and recovery between efforts.

Competition day nutrition:

• Pre-competition meal (2–3 hours before): Familiar, carb-rich, low fiber (to avoid GI distress). Examples: white rice + dal, idli + chutney, banana + toast.
• Hydration (30–60 min before): 500 ml water or coconut water.
• During match/race (if >90 min): Carbs + electrolytes. Options: sports drink (6–8% carbs, 500–750 ml/hour), banana, energy gel (30 g carbs), coconut water.
• Post-competition (within 30 min): Carbs + protein. Milk (300 ml) + banana, paneer sandwich + orange juice, or rice + dal.

Hydration for Indian climate: Athletes in heat (Delhi, Mumbai, Bangalore summers) can lose 1.5–2 L sweat per hour. Drink 500–1000 ml per hour (sip, don’t gulp). Include sodium (500–1000 mg sodium per hour via sports drink or salt tablets) to retain fluids and maintain performance.

Example match day (cricketer, 5-hour match):

• Pre-match (7 AM): 2 idli + sambar, 1 banana, 300 ml milk
• During match (every 2 overs): Sips of coconut water (total 1–1.5 L), 1–2 dates or banana at mid-innings
• Post-match (1 PM): Paneer + roti + orange juice (carbs + protein + electrolytes)
• Evening snack: Banana + curd (recovery nutrition)
• Dinner (8 PM): Rice + dal + fish + vegetables

4Recovery/post-season nutrition (rebuild)

After competition ends, recovery phase lasts 2–4 weeks. Training volume and intensity are minimal.

Calorie target: Maintenance or slight deficit (100–200 kcal below). No surplus is needed; focus is health, not growth.

Macronutrient distribution:

• Carbs: 50–55% (training is light; carb needs drop)
• Protein: 1.4–1.6 g per kg (maintain muscle, but not build)
• Fat: 25–30% (include healthy sources: olive oil, nuts, fish)

Post-season quality focus:

• Whole grains (brown rice, ragi, millets) over white rice
• Vegetables at every meal (spinach, broccoli, tomatoes, beans)
• Fruits (apples, oranges, papaya) daily
• Nuts and seeds (almonds, sunflower seeds, flax seeds)
• Healthy fats (olive oil, coconut oil, fish)

Example recovery day (2000 calories):

• Breakfast (400 kcal): Oats (50 g) + apple + almonds (30 g) + milk (200 ml)
• Mid-morning (150 kcal): Orange + walnuts (25 g)
• Lunch (600 kcal): Brown rice (1.5 cups) + dal + spinach curry (200 g spinach) + olive oil (1 tsp)
• Snack (150 kcal): Curd (150 ml) + berries
• Dinner (400 kcal): Roti (2) + grilled fish (100 g) + broccoli + tomato salad
• Supper (300 kcal): Herbal tea + biscuit

Key Takeaways:

• Off-season: high calories (surplus 300–500), high carbs, high protein (1.8–2.2 g/kg) for growth.
• Pre-competition: maintenance-to-high calories, high carbs, moderate protein (1.6–2.0 g/kg) for sharpening.
• Competition: maintenance calories, high carbs, adequate protein, strategic hydration and electrolytes.
• Recovery: maintenance-to-low calories, moderate carbs, moderate protein (1.4–1.6 g/kg), high micronutrient focus.
• Practical Indian meals work for all phases if macros are tracked and adjusted.

Next: In 1.9, we zoom into the competition season and show how nutrition changes day-to-day based on match schedule.

Nutrition Across the Competition Season

Learning goal: Understand how to feed athletes day-by-day during competition season when matches are frequent and recovery is critical.

Bridge in: In 1.8, you learned competition phase nutrition is maintenance calories with high carbs and strategic recovery. But competition isn’t one event—it is a season of multiple matches. How do you feed an athlete with matches twice weekly?

1The competition season calendar

Competition season varies by sport. Cricket (IPL, international): matches every few days for weeks. Badminton (national circuit): tournaments every 2–3 weeks, sometimes back-to-back. Football (league): 1–2 matches per week for 6 months. Volleyball (university): 2–3 matches per week during season. Distance running (road races): monthly or bi-monthly races plus training weeks.

The closer the match density, the more critical recovery nutrition becomes. A cricketer with matches 3 days apart must refuel hard after each match or they fatigue into the next one.

2The match-recovery-match cycle

After any hard match, the body needs:

• Glycogen refilling (1.2 g carbs per kg body weight in the first 30 min, then repeated every 2 hours for 4–6 hours total)
• Protein for muscle recovery (20–40 g within 30 min)
• Hydration (125–150% of body weight lost via sweat)
• Sleep (7–9 hours)

If the next match is 48 hours away (e.g., cricket or football), one full recovery day is available. Calories can stay high (maintain training calories or slightly above). Carbs and protein are prioritized.

If the next match is 24 hours away (e.g., back-to-back tournaments), recovery time is tight. Same calorie and macro targets apply; the athlete simply has less time to recover. Sleep becomes even more critical.

If the next match is 72+ hours away, recovery is ample. Nutrition can shift toward quality (whole grains, vegetables) while staying in maintenance calories.

3Feeding a two-match-per-week schedule

Match-day nutrition: As in 1.8. Carbs, hydration, familiar foods.

Day after match (recovery day 1):

• Calories: Maintenance (no deficit, but no surplus)
• Carbs: 7–8 g per kg (high to refill glycogen quickly)
• Protein: 1.6–1.8 g per kg (repair muscle damage)
• Hydration: 3–4 L (refill lost fluids)
• Training: Very light (easy walk, recovery swim, or off)
• Example: rice + dal (meal 1), banana + paneer (meal 2), chicken + rice (meal 3), curd (meal 4)

Day between matches (recovery day 2, training day):

• Calories: Maintenance
• Carbs: 6–7 g per kg (sustain moderate level)
• Protein: 1.6 g per kg
• Training: Moderate (technical work, conditioning, but not maximum intensity)
• Example: oats + banana (meal 1), dosa (meal 2), rice + fish (meal 3), milk (meal 4)

Match day again: As before. High carbs, optimal hydration, post-match refueling.

4Hydration in competition season

Dehydration is common in Indian sports: high heat, long matches, high sweat rate. Even 2–3% body weight loss (dehydration) impairs performance and increases injury risk.

Hydration strategy:

• Daily: Drink 3–4 L water + electrolyte source (coconut water, sports drink, or salt in meals).
• Pre-match: 500 ml water 2–3 hours before, 250 ml 15–20 min before.
• During match: 200–300 ml every 15–20 min (sip, don’t gulp), or 500–750 ml per hour total. Include carbs (4–8% solution: sports drink, diluted juice) and sodium (500–1000 mg/hour).
• Post-match: Drink 125–150% of body weight lost over 4–6 hours (e.g., if 2 kg lost, drink 2.5 L total). Include sodium (salted snack or electrolyte drink) to retain fluids.

5Monitoring fatigue and nutrition adjustment

Over a long competition season, even well-fed athletes can develop accumulated fatigue. Watch for:

• Declining performance (slower, weaker, less explosive)
• Frequent illness (low immunity)
• Slow recovery (high resting heart rate, poor sleep)
• Mood changes (irritability, low motivation)

If these appear:

• Check calories: Is the athlete eating enough? Calculate energy availability (Lesson 1.3). If EA < 30, increase calories.
• Check carbs: Are carbs sufficient for training volume + match demand? Increase white rice, pasta, bread.
• Check recovery: Are post-match refueling windows being hit? Post-match, protein + carbs must arrive within 30–60 min.
• Check sleep: Is the athlete sleeping 7–9 hours? Poor sleep compounds all nutrition efforts.
• Check micronutrients: Iron (vegetarian athletes especially), zinc, magnesium, B vitamins (high training depletes stores). Add spinach, nuts, eggs, milk.

Key Takeaways:

• During competition season with multiple matches weekly, every recovery day is precious.
• Post-match refueling (carbs + protein within 30–60 min) is non-negotiable.
• Hydration and electrolytes are critical in Indian climate; 500–1000 ml/hour during match, 125–150% weight-loss replace post-match.
• Monitor fatigue; if performance declines, check calories, carbs, recovery fueling, and sleep.
• Maintenance calories + high carbs + adequate protein + strategic hydration = sustained performance through the season.

Next: In 1.10, we step back and discuss evidence-based sports nutrition: how we know what works and how to evaluate claims.

Evidence-Based Sports Nutrition

Learning goal: Understand how to evaluate sports nutrition claims and distinguish science from marketing.

Bridge in: You now understand training periodization, energy systems, recovery fueling, and hydration. But how do we know these are true? What makes a claim “evidence-based?”

1Why evidence matters

Sports nutrition is a field where myths thrive. “Carbs make you slow.” “Eat ginger to boost immunity.” “Sports drinks are just sugar; drink only water.” “Creatine damages kidneys.” Some are true; most are wrong. Without evidence, you cannot tell.

Evidence separates what works from what doesn’t. It protects athletes from wasting money, time, and health on false claims.

2Types of evidence (from weakest to strongest)

Expert opinion: A coach or athlete says “I feel better when I do X.” Anecdotal. Could be true or placebo. Weakest form of evidence.

Observational studies: Researchers observe athletes who do X and those who don’t, and compare outcomes. Example: “We measured protein intake in 50 runners and found those eating 1.6 g/kg gained more muscle.” Better than anecdote, but cannot prove causation (maybe those runners also lifted more).

Intervention studies (quasi-experimental): Researchers give a group a nutrition intervention and measure the outcome. No control group. Example: “We gave 20 cyclists a carb-loading protocol before races and they went faster.” Better, but without a control group (cyclists on normal diet), we don’t know the carb-load caused the improvement.

Randomized controlled trials (RCT): Researchers randomly assign athletes to two groups: intervention (e.g., creatine supplementation) and control (placebo). Measure outcomes over weeks. This is the gold standard. If creatine group lifts more weight than placebo group, we have strong evidence creatine works.

Systematic reviews and meta-analyses: Researchers pool results from many RCTs on the same topic and summarize. Example: “We analyzed 23 RCTs on caffeine and sprint performance; 19 showed improvement, 4 showed no difference.” Strongest evidence because it combines many studies.

3Red flags for bad science

Funded by a supplement company: If a study showing “Product X increases performance” was paid for by Product X’s manufacturer, bias is high. Not impossible to trust, but caveat emptor (buyer beware).

No control group: A study measuring one group’s performance is weak. Maybe they would have improved anyway (placebo, adaptation, rest).

Small sample size: A study with 8 athletes is suggestive but not conclusive. A study with 200 is stronger.

Short duration: A study measuring something for 1 week is weak. A 12-week study is better (enough time for adaptation).

Anecdotes disguised as evidence: “Ten athletes used Product X and felt amazing!” This is not evidence; this is marketing.

Appeal to authority: “Dr. X (who happens to be a celebrity) endorses Product Y.” The doctor may not be a sports nutrition expert; don’t assume.

4How to evaluate nutrition claims

Step 1: Find the source. Is it a peer-reviewed journal (e.g., Journal of Sports Nutrition) or a supplement company website?

Step 2: Identify the study design. Is it an RCT, observational, or anecdote?

Step 3: Check the sample size. Over 50 athletes? Under 20?

Step 4: Check for conflict of interest. Who funded it?

Step 5: Ask: How big is the effect? A 1% improvement in a 100-athlete study might be statistically significant (not due to chance) but practically meaningless. A 10% improvement is more useful.

Step 6: Check for replication. Has another team confirmed the finding? One study is suggestive; multiple confirming studies are convincing.

5Current evidence in sports nutrition (brief summary)

Strong evidence (RCTs and meta-analyses confirm):

• Adequate calories enable adaptation to training.
• High protein (1.6–2.2 g/kg) supports muscle growth during resistance training.
• Carbs fuel high-intensity exercise and refill glycogen.
• Hydration and electrolytes improve performance in heat and long efforts.
• Creatine supplementation increases strength and muscle mass (safe).
• Caffeine improves endurance and power (0.3–6 mg/kg).
• Beta-alanine improves high-intensity repeated efforts (anaerobic sports).

Weak or conflicting evidence:

• Ginger for recovery (some studies show benefit, most don’t).
• Tart cherry juice for DOMS (promising, but few large RCTs).
• Branched-chain amino acids (BCAAs) for muscle building (unlikely if total protein is adequate).
• Superfoods (acai, goji berries) for performance (marketing, not evidence).

No or harmful evidence:

• Detox diets (body has liver and kidneys; no detox needed).
• Homeopathic supplements (no active ingredients; placebo).
• High-dose sodium bicarbonate (can cause GI distress; benefit marginal).

Key Takeaways:

• Evidence hierarchy: anecdote < observation < quasi-RCT < RCT < systematic review.
• Red flags: funding by the company, no control group, tiny sample, short duration, anecdotes.
• Evaluate claims by asking: Source? Design? Sample? Conflict of interest? Effect size? Replication?
• Strong evidence supports calories, protein, carbs, hydration, creatine, caffeine, and beta-alanine.
• Weak or marketing evidence supports superfoods, detox, most herbal supplements, and BCAAs (if protein is adequate).

Next: In 1.11, we summarize Chapter 1: the foundations of sports nutrition, from energy systems to evidence-based choices.

Chapter 1 Revision

Learning goal: Revisit and consolidate the key concepts from Chapter 1.

Bridge in: You have now learned the fundamentals of sports nutrition: how the body fuels exercise, how nutrition enables adaptation, how to time nutrients across training phases, and how to evaluate evidence. Here is a summary to anchor these concepts.

1Core concepts recap

Energy systems: Three gears. ATP-PC (0–15 sec, max power), anaerobic glycolysis (30 sec–3 min, high power + lactate), aerobic (3+ min, sustainable). Each requires different nutrition.

Energy availability: Calories available after exercise burn. Below 30 kcal/kg lean mass = RED-S (hormonal collapse, weak bones, low immunity). High EA (45–60+ kcal/kg) = adaptation and health.

Training adaptation: Stimulus (hard workout) → Recovery (refuel, rebuild) → Adaptation (stronger) → Repeat. Miss recovery, adaptation stalls.

Performance vs. health nutrition: Different goals. Performance = match fuel to training demand. Health = disease prevention and longevity. Best practice: performance during season, health in off-season.

Substrate utilization: Low intensity = fat; high intensity = carbs. Aerobic training increases fat-burning capacity (metabolic flexibility).

Periodization: Four phases. Off-season (build, high calories + carbs + protein), pre-competition (sharpen, mod-high calories + high carbs), competition (maintain, maintenance calories + high carbs + strategic hydration), recovery (deload, low-mod calories + quality nutrients).

Evidence-based practice: Trust RCTs and systematic reviews. Ignore anecdote and marketing. Strong evidence: calories, protein, carbs, hydration, creatine, caffeine.

2Key takeaways per lesson

3Quick assessment tool

Ask an athlete these five questions to understand their nutritional needs:

1. How many hours per week do you train? (More than 5 = sports nutrition needed)
2. What is your sport? (Determines dominant energy system)
3. Are you in off-season, pre-competition, or competition? (Determines calorie and macro target)
4. How much protein do you currently eat? (Likely too low if below 1.6 g/kg)
5. Do you refuel after hard sessions? (If no, energy availability is likely low)

The answers guide your nutrition plan.

Key Takeaways:

• Energy systems, energy availability, periodization, and evidence-based choices are the four pillars of sports nutrition.
• Nutrition must be phase-specific and tailored to the athlete’s sport and training demand.
• Post-workout refueling (carbs + protein) and hydration are non-negotiable.
• Evidence-based practice protects athletes from wasted money and false claims.

Next: In 1.12, we apply Chapter 1 through case studies, then move to Chapter 2 (energy systems in depth).

Assessment & Athlete Case Studies

Learning goal: Apply Chapter 1 concepts to real athletes and troubleshoot their nutrition plans.

Bridge in: Now that you understand sports nutrition foundations, let’s see how they work in practice. Here are three Indian athletes with nutrition challenges; diagnose and solve.

1Case Study 1: Raj, Distance Runner

Profile: Raj, 26, male, Mumbai-based marathoner. Weighs 68 kg, approximately 62 kg lean. Trains 80 km per week (10 hours training/week). Eating approximately 2200 kcal daily. Mostly vegetarian: rice, dal, roti, curd, occasional paneer.

Complaints: Tired all the time. Runs feel heavy. Gets sick every 4–5 weeks. Recently injured (stress fracture in foot). Doesn’t know why.

Diagnosis: Energy availability. EA = (2200 – 900 exercise burn) / 62 = 20.9 kcal per kg. Severe RED-S. His body is in conservation mode: low immunity (infections), weak bones (stress fracture), slow recovery (tired).

Solution:

• Increase calories to 2800 per day (500 kcal surplus for endurance runner). EA would become (2800 – 900) / 62 = 30.6 kcal per kg (just out of RED-S).
• Add breakfast: oats (50 g) + banana + milk (300 ml). Lunch increase: add 1 cup extra rice. Post-workout: banana + peanut butter. Total: +600 kcal.
• Carbs: 60–70% of calories (1680–1960 kcal = 420–490 g carbs daily). Current intake probably 250 g; increase by 150–200 g.
• Protein: Increase to 110–120 g daily (1.8 g per kg lean). Add second paneer serving or extra dal portion.
• Post-run: Always refuel with banana + milk within 30 min.

Expected outcome: Within 4 weeks, fatigue should drop. Within 8 weeks, infection frequency should fall. Within 12 weeks, stress fracture should heal and new injury risk should decrease.

2Case Study 2: Priya, Strength Athlete

Profile: Priya, 23, female, Delhi-based natural bodybuilder (competing). Weighs 58 kg, approximately 48 kg lean. Trains resistance 60 min/day, cardio 20 min/day, 5 days per week. Currently cutting (trying to lose fat for competition). Eating 1600 kcal, very low carbs (20%), high protein (150 g).

Complaints: Lost her period 3 months ago. Tired in workouts; can’t lift as heavy as before. Bruises easily. Sleep is poor. Thinking about quitting.

Diagnosis: Energy availability combined with excessive calorie deficit. EA = (1600 – 450 exercise burn) / 48 = 24 kcal per kg. RED-S. Plus, 20% carbs is too low for resistance training performance; she can’t fuel her workouts. Low carbs + deficit = hormonal crash, weak bones, low energy.

Solution (immediate, priority = health over performance):

• Stop the extreme cut. Increase calories to 2000 (maintenance for her). Competition can wait; health cannot. EA = (2000 – 450) / 48 = 32.4 kcal per kg (out of RED-S).
• Increase carbs to 50% of calories (1000 kcal = 250 g carbs). Fuel for strength training. Add rice, roti, oats, fruit.
• Maintain protein at 150 g (high for muscle retention during modest cut).
• Within 6–8 weeks, her period should return and sleep should improve. Then, she can gently cut again for competition (1700 kcal, higher carbs).

Key message: Competition is not worth sacrificing health. An athlete with RED-S cannot perform well anyway; losing the period is a red flag to stop the deficit immediately.

3Case Study 3: Anand, Team Sports

Profile: Anand, 19, male, Bangalore-based cricket all-rounder (state squad). Weighs 72 kg, ~65 kg lean. Trains 2 hours daily (fitness, batting, fielding). Plays matches 2–3 per week (May–Aug competition season). Eating 2300 kcal daily. Mostly rice, dal, occasional chicken. No structure to fueling.

Complaints: Plays well first half of match; fades in second half. Gets cramps sometimes. Never eats before matches; just plays on whatever he had that morning. Doesn’t refuel after matches.

Diagnosis: Energy availability is borderline (EA = (2300 – 600) / 65 = 26.2 kcal per kg; low RED-S range). But the main issue is fueling strategy: no pre-match carbs (blood glucose depletes mid-match), no intra-match fueling (glycogen runs out, cramps occur), no post-match recovery (glycogen doesn’t refill for next match).

Solution:

• Increase daily calories to 2700 (maintenance for 2-hour daily training). Add breakfast oats, midday snack, post-workout banana. Keep all phases balanced.
• Pre-match (2 hours before): White rice + dal + paneer (familiar, carb-rich, low fiber). Example: 1 cup white rice + 0.5 cup dal + 50 g paneer.
• During match (if 5+ hours): Coconut water (500–750 ml per hour) + 1–2 bananas or dates (to prevent cramps and fatigue). Practice this in nets, not in actual match first time.
• Post-match (within 30 min): Paneer sandwich + banana + milk or sports drink. Refuel aggressively. Glycogen resets for next match.
• Hydration: 3–4 L daily. During match: 200 ml every 15 min in heat. Post-match: drink 125–150% of weight lost.

Expected outcome: Fatigue in second half should drop. Cramps should disappear. With proper fueling and hydration, Anand can maintain or improve performance throughout a 5-hour match.

4Key lessons from case studies

1. Always calculate energy availability first. It is the foundation. If EA is low, nothing else matters; fix it first.

2. Match nutrition to sport and phase. A marathoner needs different nutrition than a strength athlete; competition season differs from off-season.

3. Fueling timing is as important as total intake. Anand was eating enough total calories, but not at the right times for his sport.

4. Health is the floor; performance is built on it. Priya’s lost period is a sign to restore health before chasing competition.

5. Hydration and electrolytes are non-negotiable in India. Heat and sweat loss are extreme; strategy must be in place.

Key Takeaways:

• Energy availability (EA) is the foundation; calculate it first.
• RED-S (EA < 30) causes hormonal collapse, weak bones, low immunity, and poor performance.
• Fueling timing (pre-, intra-, post-workout) is as critical as total intake.
• Sports nutrition must match the athlete’s training phase and sport.
• Health always takes priority over performance.

Where this leads next: Chapter 2 dives deep into the three energy systems: ATP-PC, anaerobic glycolysis, and aerobic oxidation. You’ll learn the detailed physiology, how training adapts each system, and how to fuel them optimally. Armed with Chapter 1’s foundations, Chapter 2 will make sense quickly.