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Yes bacteria and enzymes. For example asian people have a hard time digesting dairy products and alcohol. Europeans digest both easily. Europeans are not suppose to eat soy products because they dont asimilate it, this is where disease starts for most of humans.
Its when they start a different diet. I say eat like your ancestors did and you will be fine. Know your biochemical individuality your metabolic type and eat accordingly to it.
Never diet

Yeah but our evolutionary ancestors are all vegans :)

Peace

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