Young Athlete Nutrition: Sports Nutrition, Growth, Recovery & Epigenetics by Ori Scott M.Sc. Nutrition, RD.

Educational guide • Young athletes approximately ages 11–18

Food must support GROW + LEARN + TRAIN + PLAY + RECOVER

Young athletes are not simply “small adults.” Their nutrition must support normal growth and development while also covering the energy and nutrient demands of training, competition, recovery, school, and daily life.

1. Important Educational Note

This guide is educational and is not a substitute for individualized pediatric, sports-medicine, or dietetic assessment.

Growth stage, sex, training load, sport, body size, food preferences, medical history, laboratory findings, menstrual history when relevant, and injury history can materially change nutrition needs.

Avoid restrictive dieting, intentional dehydration, or supplement use in a minor without appropriate professional oversight.

2. Why Young Athletes Need Special Nutrition

Adolescence combines rapid physical growth, bone development, hormonal maturation, brain development, school demands, and athletic training.

Energy and nutrient intake therefore has two simultaneous jobs: support development and support sport.

Insufficient intake may affect training quality, recovery, bone health, endocrine function, immunity, mood, and performance.

3. Genes, Epigenetics & the Developing Athlete

Genes provide biological instructions; epigenetic mechanisms help regulate how strongly some genes are expressed without changing the DNA sequence itself.

Exercise, sleep, nutrition, development, and other environmental exposures can interact with epigenetic regulation.

Epigenetics should not be used to promise that a specific food or supplement can “switch on athletic genes.” Human sports evidence is developing, and individualized nutrition should not be based on genotype or epigenetic claims alone.

4. Pediatric Epigenetic Evidence: What We Can and Cannot Say

Epigenetic research provides biologically plausible links between nutrition, exercise, metabolism, inflammation, tissue repair, and adaptation.

However, direct evidence that a particular childhood or adolescent sports diet produces a specific beneficial long-term epigenetic outcome is limited.

Practical nutrition recommendations should therefore remain grounded in established pediatric and sports-nutrition principles rather than speculative molecular claims.

5. Energy Needs, Low Energy Availability & RED-S

Energy availability is the energy remaining for normal physiological function after exercise energy expenditure is accounted for.

Problematic low energy availability can contribute to Relative Energy Deficiency in Sport (RED-S), which can affect athletes of any sex.

Possible consequences include impaired bone health, endocrine and reproductive disturbances, reduced training response, illness, injury, mood changes, and poorer performance.

Young athletes should not routinely pursue aggressive calorie restriction or rapid weight loss.

6. Athlete vs. Non-Athlete: Why Requirements Differ

A young athlete still needs the nutrients required by a non-athlete for growth and normal development, plus additional fuel and recovery support for training.

Training increases carbohydrate use, fluid losses, tissue remodeling, and recovery demands.

Needs vary considerably between a lightly active child and an adolescent training intensely most days of the week.

7. Nutrition Education: Intervention vs. Control Evidence

Nutrition education can improve sports-nutrition and RED-S knowledge in adolescent athletes, especially when delivered by qualified professionals.

Current intervention literature is heterogeneous, and improved knowledge does not automatically prove improved long-term energy availability, health, or performance.

Education should involve the athlete and, when appropriate, parents/caregivers and coaches.

8. Protein: Growth, Muscle Repair & Recovery

Protein supplies amino acids needed for growth, tissue maintenance, muscle remodeling, and recovery.

Protein is best distributed across meals and snacks rather than concentrated in one very large meal.

Food-first options include eggs, dairy or fortified alternatives, poultry, fish, lean meats, soy foods, beans, lentils, nuts, and seeds, selected according to the athlete’s preferences and needs.

More protein is not automatically better; adequate total energy and carbohydrate remain essential.

9. Carbohydrates: The Main Training Fuel

Carbohydrate is an important fuel for moderate- and high-intensity exercise and helps support training quality and glycogen restoration.

Carbohydrate intake should reflect training duration, intensity, and timing rather than being chronically minimized.

Useful foods include grains, potatoes, fruit, legumes, dairy foods, and other minimally processed carbohydrate sources, with convenient sport foods used when appropriate.

Chronically low carbohydrate availability may be especially problematic in a growing athlete.

10. Bone Health: Calcium & Vitamin D

Adolescence is a critical period for bone mineral accrual. Adequate energy, calcium, vitamin D, protein, and weight-bearing activity all matter.

Calcium-rich foods can include milk, yogurt, cheese, calcium-set tofu, fortified alternatives, and other calcium-containing foods.

Vitamin D status depends on multiple factors; supplementation should be individualized rather than automatically prescribed at high doses.

Recurrent bone stress injuries warrant professional assessment, including consideration of low energy availability.

11. Iron

Iron supports oxygen transport, energy metabolism, cognition, and athletic performance.

Risk can increase during rapid growth, with menstrual blood loss, low-energy diets, vegetarian/vegan diets that are not well planned, or high training loads.

Food sources include meat and seafood where consumed, legumes, tofu, fortified cereals, seeds, and leafy vegetables. Vitamin C-rich foods can improve absorption of non-heme iron.

Iron supplements should not be used simply “for energy” without appropriate assessment because excess iron can be harmful.

12. Girls: Menarche & Menstrual Cycles

Menstrual health is an important health indicator in adolescent athletes.

Delayed menarche, newly irregular cycles, or loss of previously established periods can be associated with inadequate energy availability and deserves medical evaluation.

Menstrual changes should not be normalized as an unavoidable consequence of serious training.

Iron needs and iron status deserve particular attention when menstrual losses are substantial.

13. Boys: Growth, Puberty & RED-S

Boys are also vulnerable to low energy availability and RED-S.

Rapid growth combined with large training loads can make under-fueling unintentional: the athlete may simply fail to eat enough to match needs.

Warning signs can include recurrent injury, fatigue, declining performance, poor recovery, mood changes, or concerns about growth and pubertal progression.

14. Hydration, Electrolytes & Nutrient Losses

Young athletes should begin exercise well hydrated and replace fluid losses according to environment, sweat rate, exercise duration, and individual tolerance.

Water is appropriate for many routine sessions. Longer, hotter, or very intense sessions may require additional carbohydrate and electrolytes.

Sodium losses vary substantially among athletes; one universal electrolyte prescription is inappropriate.

Energy drinks and highly caffeinated products are not equivalent to sports drinks and are generally inappropriate for children and adolescents.

15. Parent & Athlete Action Checklist

Eat regular meals and planned snacks; do not routinely skip food around training.

Include carbohydrate before demanding sessions and combine carbohydrate with protein after training when the next normal meal is not soon.

Build meals around a variety of grains/starches, vegetables and fruit, protein foods, and calcium-rich foods.

Keep water readily available and increase attention to hydration in heat and during long sessions.

Prioritize adequate sleep and recovery alongside nutrition.

Avoid weight-focused language and unnecessary dieting in growing athletes.

Seek qualified assessment for recurrent injuries, bone stress injury, persistent fatigue, dizziness, declining performance, significant weight change, restrictive eating, delayed/irregular menstruation, or concerns about growth/puberty.

Use supplements only for a defined reason, with attention to safety, contamination risk, dose, and age appropriateness.

Practical Training-Day Framework

The exact amounts must be individualized. A simple structure for many young athletes is:

Timing	Purpose / examples
Breakfast	Energy for school and growth: carbohydrate + protein + fruit + calcium-rich food.
Lunch	Balanced meal with carbohydrate, protein, vegetables/fruit and fluids.
1–3 h before training	Easy-to-digest carbohydrate plus some protein; limit unusually heavy/fatty foods if they cause discomfort.
During training	Water for many sessions; longer/hotter/high-intensity sessions may need carbohydrate/electrolytes.
After training	Carbohydrate + protein + fluids; follow with a normal balanced meal.
Evening	Enough total food to cover training and growth; avoid finishing the day in a large energy deficit.

Myths vs. Evidence

Myth: “A lighter young athlete is always faster.”

Evidence: Performance and health can deteriorate when weight loss creates inadequate energy availability.

Myth: “Protein alone builds an athlete.”

Evidence: Training adaptation requires adequate total energy, carbohydrate, protein, micronutrients, sleep and recovery.

Myth: “Missing periods is normal for female athletes.”

Evidence: Menstrual disturbance can be a clinical warning sign and should be assessed.

Myth: “RED-S is only a female problem.”

Evidence: RED-S can affect athletes of all genders.

Myth: “Epigenetics tells us the perfect sports diet.”

Evidence: Epigenetic research is promising, but current evidence does not justify genotype- or epigenetic-based diets for young athletes.

Bibliography:

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Evidence Boundary

The strongest practical evidence in this guide concerns adequate energy availability, carbohydrate and protein support, hydration, bone-health nutrients, iron, and recognition of RED-S. Epigenetic and nutrigenetic findings are included as an emerging research area; they should not be interpreted as evidence for gene-targeted diets or supplements in children and adolescents.