What is the approximate percentage of DEE contributed by physical activity in highly active individuals?

In highly active individuals, physical activity significantly contributes to total Daily Energy Expenditure (DEE), which is the total amount of calories burned in a day. For these individuals, the percentage of DEE attributed to physical activity can approach or even equal Basal Metabolic Rate (BMR), which constitutes the energy expended at rest to maintain vital physiological functions.

For highly active individuals, physical activity's contribution becomes a substantial part of their total daily energy utilization due to their elevated levels of exercise and movement throughout the day. Since BMR typically comprises around 60-75% of DEE, the activity levels of highly active individuals can drive the overall energy expenditure to match or surpass the BMR itself, which is reflected in the answer choice confirming that physical activity may equal BMR.

In contrast, the other options represent estimates that do not accurately reflect the real impact of physical activity on DEE for such individuals. For example, suggesting that physical activity contribution is only up to 10% grossly underestimates the energy demands of highly active lifestyles. Similarly, providing percentages like about 50% or more than 75% do not accurately contextualize how the energy expenditure from regular, vigorous activities aligns with resting metabolic needs, making the notion that physical