Sports nutrition is based on a simple physiological principle: during exertion, blood flow is diverted from the digestive system to supply the working muscles. This mechanism influences everything from food choices to meal timing. Adapting one’s diet to training is about working with this biological reality rather than against it.
Carbohydrate Oxidation During Exercise: The Thresholds That Change Strategy
Most nutrition guides repeat that one should eat carbohydrates before and after exercise. The real lever lies in the quantity and type of carbohydrates consumed during exertion, depending on its duration.
For sessions lasting about an hour, a simple mouth rinse with a carbohydrate solution is enough to enhance performance. The brain detects the presence of glucose without the stomach being engaged, which limits digestive issues while stimulating available energy.
For two to three hours of exercise, about 60 g of carbohydrates per hour from a single source (glucose alone, for example) meets the needs for muscle oxidation. Beyond that, in ultra-endurance, recommendations rise to 90 g/h, but with one condition: combine glucose and fructose. This combination utilizes two distinct intestinal transporters, which increases total absorption and reduces the risk of bloating or cramps.
Understanding these thresholds allows for tailoring one’s dietary strategy to each type of session rather than applying a one-size-fits-all recipe. To delve deeper into these principles daily, Y a du Sport’s nutrition advice details protocols suited to each athlete profile.
Proteins and Muscle Recovery: Metabolic Window and Useful Quantities
After intense exertion, muscle fibers exhibit micro-tears. The muscle protein synthesis that allows for their repair directly depends on the intake of amino acids in the hours following training.
The concept of the “anabolic window” (the 30 to 60 minutes post-exertion) has long dominated recommendations. Recent data nuance this urgency: the recovery window extends over several hours, especially if the last meal before exertion already contained protein. The goal is not to rush for a shaker in the locker room but to distribute protein intake throughout the day.
For regular athletes, distribution matters more than the total amount. Three to four meals each containing a significant portion of protein (poultry, eggs, legumes, dairy products) support recovery better than a single very rich meal.
Plant Proteins and Combinations
Plant proteins often have an incomplete amino acid profile when taken in isolation. Combining grains and legumes in the same meal compensates for this limitation. Rice and lentils, couscous and chickpeas: these classic combinations provide all the necessary amino acids for muscle reconstruction.
Hydration and Electrolytes: Beyond Pure Water
Dehydration, even mild, directly affects performance. A moderate loss of fluids already leads to a decrease in endurance capacity, a reduction in muscle strength, and a slowing of reflexes. Drinking water is not always sufficient.
During prolonged exertion, sweating leads to a significant loss of sodium, potassium, and magnesium. Replacing these electrolytes prevents cramps and maintains muscle contraction. Sports drinks containing minerals meet this need, where plain water dilutes the sodium concentration in the blood without restoring it.
- Before training: drink regularly in the two hours prior, in small amounts, to arrive hydrated without feeling heavy
- During exertion lasting more than an hour: alternate water and electrolyte-containing drinks, favoring small frequent sips
- After exertion: compensate for fluid loss with mineral-rich water or a salty broth, which accelerates rehydration compared to still water
Dietary Supplements for Athletes: Distinguishing the Useful from the Superfluous
The sports nutrition market is experiencing rapid growth, driven by increased accessibility to the general public. This expansion is accompanied by a proliferation of products, many of which rely on vague promises.
Some supplements have solid data regarding sports performance:
- Creatine improves capacity during short, intense efforts (sprints, weightlifting). Its effect on recovery between sets is well documented
- Caffeine, consumed before exertion, increases alertness and delays the sensation of fatigue, with a measurable effect on endurance
- Carbohydrate and electrolyte-based drinks, already mentioned, constitute a functional dietary supplement directly related to performance
- The 2024-2025 trend also includes compounds aimed at cognitive performance (concentration, reaction time), a focus long ignored by traditional sports nutrition
What Requires Caution
Fat burners, multi-ingredient “boosters,” and “all-in-one” formulas rarely display comparable evidence of effectiveness. A balanced diet covers most needs without resorting to a cabinet full of supplements. Before adding a product, checking if it compensates for an identified deficiency remains the most reliable approach.
Sports nutrition does not need to be complex to be effective. Adapting carbohydrates to the duration of exertion, distributing protein intake throughout the day, maintaining hydration with the right minerals: these three axes cover the essentials. The rest is a matter of individual adjustment, guided by practice and observation of one’s own digestive and energy responses.
