What are the primary nutritional requirements for young athletes practicing tennis, basketball, and football?

The primary nutritional requirement for athletes is sufficient carbohydrate intake to maintain the necessary training load.
The athlete's diet should be rich in high biological value proteins.
Micronutrients such as vitamins and minerals play an important role in the athlete's body, mainly at the metabolic level.
The nutritional requirements for these three sports vary between 2000-4000 kcal.
The study included 45 athletes, 15 from each sport, with a minimum of 4 hours of training per week and at least 5 years of experience in the sport.