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Technically speaking, from an evolution stand point. Our digestive system is designed to eat meat. It's things like breads and beans we're not supposed to eat (we only started eating those in the past few thousand years because we're able to process them and turn them into foods). We've been eating meat, veggies, and fruits for however long we've been on this planet - our digestive system has been fine tuned to handle that type of stuff. However it's not like "bread" was hanging off trees a million years ago. It's an invention of man - we take the wheats and grains and process them into something we can cook which then becomes food. Things like that are relatively new to our digestive system.
^ Just some interesting things to think about
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