Overpopulation is no longer a problem, China is no longer replacing it's population and the same can be said for other large countries. Overpopulation will soon be taken by ageing population.
If you were to consume substantial protein and were in a caloric deficit then your body would have no choice but to retain the muscle mass and lose the fat. So perhaps he's right but it'll depend on whether he'd recommend more carbs or proteins.
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