Your Basal Metabolic Rate — the energy your body burns at complete rest just to keep the lights on, before any movement or exercise.
This is what your body needs before you take a single step. Multiply it by an activity factor to get your total daily calorie need (that's your TDEE).
Calculated with the Mifflin–St Jeor equation, considered the most accurate formula for most adults. It doesn't account for muscle mass directly — very lean or very muscular people may burn somewhat more than this number suggests.
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