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The recommendation of 30 calories per kilogram for healthy young adults is grounded in nutritional science and serves as a guideline for estimating daily caloric needs. This caloric intake supports various bodily functions, including metabolism, growth, and overall energy expenditure, particularly for individuals with an active lifestyle.

This calculation is typically used for individuals who engage in moderate levels of physical activity; therefore, it assumes a balanced energy requirement that considers both basal metabolic rate (BMR) and the energy utilized during physical activity.

In contrast, caloric estimates that are lower or higher, such as 25, 35, or 40 calories per kilogram, may not adequately reflect the needs of physically active young adults. A lower caloric estimate may result in insufficient energy for maintaining weight and supporting daily activities, while a higher caloric estimate may lead to excessive caloric intake and potential weight gain if not balanced with energy expenditure.

Thus, the recommended intake of around 30 calories per kilogram aligns with health guidelines and achieves a balance conducive to maintaining energy levels, supporting metabolic processes, and accommodating an active lifestyle among young adults.