Why, yes, it's a typical confounding situation with exercise and diets. As you probably know, it's difficult to do calorimetry on humans, but if I recall correc

Why, yes, it's a typical confounding situation with exercise and diets. As you probably know, it's difficult to do calorimetry on humans, but if I recall correctly it is partly lowered heat generation (which doesn't necessarily change the core temperature you measure with a thermometer) and moving around less.