Sports nutrition refers to all dietary strategies aimed at meeting the energy and structural needs imposed by training. Far from a simple list of miracle foods, it relies on precise physiological mechanisms: glycogen replenishment, muscle protein synthesis, and maintenance of hydro-electrolytic balance. Adapting one’s diet to the nature and frequency of efforts changes the quality of recovery and, by extension, progression.
Carbohydrates and glycogen replenishment: timing matters less than we think
Carbohydrates remain the main fuel for high-intensity efforts. Muscles store glucose in the form of muscle glycogen, and it is the depletion of these reserves that causes the feeling of fatigue at the end of a session.
Most guides emphasize the post-workout snack consumed within thirty minutes. Recent positions from the International Society of Sports Nutrition (ISSN) nuance this dogma: the tight timing of carbohydrates is critical only if the next effort occurs within four to eight hours. A runner who trains in the morning and does not have another session until the next day can spread their carbohydrates across all their meals without losing effectiveness.
When the window between two sessions is short (double session, multi-day competition), prioritizing high glycemic index carbohydrates right after the effort speeds up glycogen resynthesis. Outside of this case, it is better to focus on the total amount of carbohydrates ingested throughout the day rather than the exact minute of the meal.
Diving deeper into nutrition with Profil Sport allows for better calibration of these intakes based on the type of activity practiced.
Proteins and muscle recovery: daily quantity above all
Proteins provide the amino acids necessary for repairing muscle fibers stressed during exercise. Muscle protein synthesis is activated after each session, but it remains elevated for several hours, not just in the half-hour that follows.
For a regular athlete, the main challenge is to achieve a sufficient daily intake, spread over three to four servings. Splitting protein intake throughout the day maintains a more constant anabolic signal than a single high-protein meal in the evening.
Protein supplements: useful or superfluous
A whey powder or a protein-creatine mix does not replace a complete meal. These supplements find their usefulness in two specific situations:
- When logistics prevent a proper meal in the hours following training (travel, irregular schedules).
- When post-exercise appetite is low and a liquid is more palatable than solid food.
- When the basic diet (strict vegetarian, for example) makes it difficult to reach branched-chain amino acid intake.
Outside of these cases, common foods (eggs, poultry, fish, legumes) largely cover the needs.
Individualized hydration: beyond two liters per day
Drinking enough during exercise is an acquired reflex. Drinking too much, however, is a risk that mainstream content rarely addresses. Hyponatremia, a dangerous drop in blood sodium caused by excessive water intake, mainly affects prolonged efforts lasting several hours.
The current trend, notably supported by the National Athletic Trainers’ Association, is to personalize hydration based on individual sweat rate. Specifically, weighing oneself before and after a typical training session allows for estimating sweat losses and adjusting consumption.
A point of caution often overlooked: any weight gain during exercise signals overhydration, not proper hydration. Replacing all fluid losses during the session is no longer recommended. The goal is to limit body weight loss without fully compensating for it.
Electrolytes and sports drinks
Water alone is sufficient for sessions lasting less than an hour at moderate intensity. Beyond that, a drink containing sodium and carbohydrates helps maintain performance and intestinal absorption of water. Electrolyte tablets allow for dosing sodium according to one’s sweat profile, which is more precise than a standard isotonic drink with fixed concentration.
Adapting one’s diet to training phases
A fixed nutrition plan year-round ignores a physiological reality: energy needs vary according to the volume and intensity of training. During a loading phase (competition preparation, volume block), carbohydrate intake should increase to support expenditure. During a recovery or break phase, reducing it avoids unnecessary caloric surplus.
Proteins, on the other hand, remain relatively stable regardless of the period: tissue repair continues even during weeks of relative rest. Lipids play a role in hormone production and should not be sacrificed in favor of carbohydrates, even during high-load periods.
- Intensive phase: increase carbohydrates at each meal, maintain proteins, do not reduce lipids below a reasonable threshold.
- Recovery phase: slightly decrease carbohydrates, keep the same protein intake, reintroduce pleasure foods without guilt.
- Pre-competition: test each food or drink planned for race day during training to avoid any digestive surprises.
Sports nutrition becomes more effective when adjusted in cycles rather than fixed recipes. The consistency between the training plan and the dietary plan remains the most underutilized lever for progress among regular practitioners.