Evidence supporting the use of: Calories
For the health condition: Endurance (lack of)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 5

Calories are a scientifically validated means to support and treat endurance, particularly in the context of physical activity and sports performance. Endurance activities such as long-distance running, cycling, or swimming require sustained energy output over an extended period. The human body relies on calories, which are units of energy derived from macronutrients (carbohydrates, proteins, and fats), to fuel muscular activity. Numerous studies have demonstrated that inadequate caloric intake leads to early fatigue, decreased performance, and impaired recovery in endurance athletes. Conversely, meeting or slightly exceeding caloric requirements has been shown to maintain glycogen stores, delay the onset of fatigue, and support optimal performance.

Research published in journals such as the Journal of Applied Physiology and Medicine & Science in Sports & Exercise consistently underscores the importance of adequate caloric intake before, during, and after endurance events. Carbohydrates are particularly emphasized due to their role in maintaining blood glucose and muscle glycogen, but fats and proteins also contribute to overall energy availability. Caloric deficits are associated with symptoms of overtraining, increased risk of injury, and impaired immune function. Thus, the use of calories to support and treat lack of endurance is firmly grounded in scientific evidence, with established guidelines from authoritative bodies such as the American College of Sports Medicine and the International Olympic Committee.

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