The athlete's diet should provide the right amount of energy, essential vitamins, minerals, and protein plus adequate water. No single food or supplement can provide all the daily requirements. A variety of foods are needed every day.

Competitive athletes, sedentary individuals and people who exercise for health and fitness all need the same basic nutrients. Particular health conditions may require additional supplementation. The intensity of an individual sports or training program may cause some athletes to have higher calorie and fluid requirements. Eating a variety of foods to meet increased calorie needs helps to ensure that the athletes diet contain appropriate amounts of carbohydrate, protein, vitamins and minerals. Various supplements are useful for those individuals who are interested in endurance exercise and muscle strength.