What percentage of total daily energy expenditure is attributed to resting energy?

Resting energy expenditure (REE) represents the largest portion of total daily energy expenditure (TDEE) in most individuals. This energy is utilized for basic physiological functions that sustain life, including breathing, circulation, temperature regulation, cell growth, and maintenance of organ function while at rest.

Typically, resting energy expenditure accounts for about 60-75% of the total daily energy expenditure. This percentage varies based on factors such as age, sex, body composition, and overall health. The high percentage reflects the significant energy required by the body for maintenance activities even when it is not engaged in physical activity.

The other options do not align with the established scientific understanding of energy expenditure distribution. For instance, percentages like 30-40%, 15-25%, and 10-15% would significantly underestimate the energy needed for basic bodily functions, which is crucial for survival and overall health. Thus, recognizing that resting energy expenditure constitutes such a substantial portion of total energy expenditure helps emphasize the importance of metabolic processes in daily energy balance.