Nutrition Fundamentals Every Coach Should Know

The Coach's Role in Athlete Nutrition

Coaches are not dietitians — and you should not pretend to be. But you have significant influence over athlete behavior, and many of the most common performance problems coaches attribute to fitness or skill actually have a nutritional root.

Tired athletes who fade in the second half are often underfueled. Athletes who cramp frequently are often inadequately hydrated. Slow recovery between games often comes down to what happens in the 45 minutes after the final whistle.

This guide gives you actionable, evidence-based fundamentals you can share with athletes and families.

The Energy Foundation: Carbohydrates Are Not the Enemy

For most team sport athletes, carbohydrates are the primary fuel source. Glucose derived from carbohydrates is what powers explosive sprints, directional cuts, and sustained high-intensity effort.

Low-carbohydrate diets, which are trendy in adult wellness circles, are generally inappropriate for youth athletes in season. Athletes who restrict carbohydrates will often:

• Experience late-game fatigue
• Have slower reaction times
• Report feeling "heavy-legged" during training

Practical guidance to share with athletes and families:

• Pre-game meals should be carbohydrate-centered (pasta, rice, potatoes, oats) with moderate protein and low fat
• Avoid high-fat foods in the 3 hours before competition (fat slows digestion and causes sluggishness)
• Simple carbohydrate snacks (banana, sports bar, crackers) 30–60 minutes before game time can top off glycogen stores

Pre-Game Nutrition Timing

The timing of food relative to competition matters significantly:

Common pre-game nutrition mistakes to address:

• Athletes skipping pre-game meals due to nervousness (teach that fuel is performance)
• Athletes eating a heavy meal 30–60 minutes before (leads to cramping, sluggishness)
• Athletes consuming energy drinks or caffeine (dangerous for youth; disrupts focus and hydration)

Hydration: The Most Overlooked Performance Variable

Even 2% dehydration measurably impairs athletic performance — reducing strength, speed, and cognitive function. Yet studies consistently show that youth athletes arrive at training already mildly dehydrated.

Hydration targets:

• 16–20 oz of water 2–3 hours before exercise
• 8–10 oz 20–30 minutes before exercise
• 4–8 oz every 15–20 minutes during exercise
• 16–24 oz of water or sports drink for every pound lost post-exercise

Sports drinks (with electrolytes) are appropriate for sessions exceeding 60 minutes or in high heat/humidity. For shorter sessions, water is sufficient.

Post-Game Recovery Nutrition

The 30–45 minutes after competition is the anabolic window — the period when muscles are most receptive to nutrients for repair and glycogen replenishment.

Recovery nutrition targets:

• Carbohydrates: 0.5–0.7 g per pound of body weight to replenish glycogen
• Protein: 20–30 g to stimulate muscle repair
• Fluid: Begin aggressive rehydration immediately

Practical recovery snack ideas:

• Chocolate milk (genuinely excellent recovery food — carbs + protein + fluid)
• Greek yogurt with fruit
• Turkey or peanut butter sandwich on whole grain bread
• Smoothie with milk, banana, and protein powder

Addressing Weight and Body Image Sensitively

Youth athletes are particularly vulnerable to body image issues. Never comment on an individual athlete's body weight or composition. If you observe signs of disordered eating, refer to your athletic trainer, school counselor, or medical professional.

When discussing nutrition as a team, always frame it as performance fueling — not weight management.

One Action for This Week

Share a one-page pre-game nutrition guide with your team families. Keep it simple: what to eat, when to eat it, and how much water to drink. This single action will improve your team's second-half performance more than most technical adjustments.