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As it turns out, the body obeys thermodynamic laws and you will lose weight if you eat less than you burn even if its all starches and sugars.


Except that the body is not a passive black box and can adapt its burn rate - which is partially uncontrollable (meaning: not related to physical exercise, e.g. thermal regulation)


Burn rate for a sedentary 75kg human is 1600-2000 kcal/day iirc. It can't go down to 500 without dropping active tissue




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