For active individuals, how much of their daily energy expenditure may physical activity (PA) account for?

Physical activity can play a significant role in overall daily energy expenditure, especially for active individuals. When considering how much physical activity contributes, it can actually be comparable to the Basal Metabolic Rate (BMR). BMR refers to the number of calories required to maintain basic bodily functions while at rest, and in active individuals, physical activity can indeed match BMR levels depending on the intensity and duration of the exercise performed.

This helps highlight the idea that the energy expended during physical activities can be substantial and varies greatly among individuals based on their lifestyle, training routines, and metabolic factors. The correct option reflects this understanding where physical activity might equal BMR, representing a reasonable estimate for active individuals engaging in regular physical exercise.

In contrast, energy expenditure from physical activity accounting for less than 25% BMR would typically apply to sedentary individuals, and stating it equals total caloric needs does not provide an accurate relationship to BMR, as total caloric needs include BMR plus physical activity and the thermic effect of food. Saying it’s more than 50% BMR can exaggerate the contribution of physical activity relative to BMR unless the individual is extremely active or engaged in high levels of strenuous exercise. Thus, the answer demonstrating equivalence