Animals and people adapt to their environment. Human digestive systems are much more picky than animals.
Anytime you make a major change to your diet you will have some sort of discomfort as your body adapts.
You could switch to raw meats, but it would take a while to adapt.
This reminds me of the Paleo diet. Eat only what cavemen are. In reality if we are only what cavemen are, and not the modern versions of that, we would get sick until our bodies adapted.
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