Some people really are more resistant to weight gain. The explanation can include average food intake, NEAT, resting metabolism, appetite compensation, genetics and metabolic phenotype — not one magic “fast metabolism.”
InBody
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Mike’s Balance reviews InBody and other bioelectrical impedance devices: their uses, precision limits and sensitivity to hydration and measurement conditions.
You can influence daily energy expenditure, but there is no safe switch that dramatically speeds up metabolism. Muscle, movement, protein intake and avoiding extreme dieting matter more than metabolism hacks.
Can you trust your InBody or smart scale? A water experiment, an analysis of 1,924 adults and research on 15 devices explain what body-fat readings can and cannot tell you.