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Javier Zarracina / Vox
What’s important to absorb is the fact that we have very little control over our basal metabolic rate, but it's actually our biggest energy hog. "It's generally accepted that for most people, the basal metabolic rate accounts for 60 to 80 percent of total energy expenditure," said Kravitz. Digesting food accounts for about 10 percent.
That leaves only 10 to 30 percent for physical activity, of which exercise is only a subset. (Remember, physical activity includes all movement, including walking around, fidgeting, et cetera.)
The implication here is that while your food intake accounts for 100 percent of the energy that goes into your body, exercise only burns off less than 10 to 30 percent of it. That’s a pretty big discrepancy, and definitely means that erasing all your dietary transgressions at the gym is a lot harder than the peddlers of gym memberships make it seem.
It's hard to create a significant calorie deficit through exercise