Synopsis

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

Calories, as a measure of energy intake from food, have strong scientific validation in supporting and treating convalescence (the recovery period following illness, surgery, or injury). During convalescence, the body's metabolic demands are often increased due to processes such as tissue repair, immune response, and restoration of strength and function. Numerous clinical guidelines and studies emphasize the need for adequate caloric intake during recovery, as insufficient calories can lead to muscle wasting, delayed wound healing, impaired immune function, and prolonged recovery times.

For example, organizations such as the World Health Organization (WHO) and the European Society for Clinical Nutrition and Metabolism (ESPEN) recommend tailored nutritional support—including sufficient calories—for patients recovering from acute illness or surgery. Research published in peer-reviewed journals demonstrates that providing adequate energy, alongside protein and micronutrients, improves clinical outcomes such as infection rates, length of hospital stay, and physical function. In cases of undernutrition or malnutrition during convalescence, caloric supplementation—either through oral diet, enteral, or parenteral nutrition—is a cornerstone of evidence-based medical care.

Therefore, the use of calories to support or treat convalescence is thoroughly grounded in scientific evidence, with high-level recommendations and a robust body of literature supporting its importance in facilitating optimal recovery.

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