You are creating a false dichotomy – there is a range of healthy weights. Over that, you are obese and develop health problems because your body didn’t evolve to carry that weight, perform under changed metabolic conditions and deal with literal fat clogging your blood vessels. Under the range of normal weight, you develop different types of problems as the body is dealing with muscle wasting and trying to keep your brain alive. If you go significantly under the normal weight, you die.
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