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Your body’s daily calorie burn — TDEE — is the foundation every tracking decision sits on. But it’s not a fixed number you can calculate once and trust forever. Sleep, stress, hormone shifts, muscle mass, and even how long you’ve been dieting all change what your body actually does with the food you eat.
These guides cover the underlying science (BMR, NEAT, the thermic effect of food, adaptive thermogenesis) and the practical levers — strength training, sleep, protein, GLP-1 — that genuinely move the needle on metabolic health.
Your metabolism isn't broken. It also isn't a single fixed number. Here's how it actually works — what changes it, what doesn't, and how to support it without resorting to detoxes or 'metabolism boosters'.
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