“I don’t think any plant food is hard to digest for humans.”
Really? Have you never heard of fiber, or resistant starch? These are components of food from plants that, by definition, cannot be digested by humans. Some of this may be digested by bacteria in your gut, and some might not be digested by anything.
On the other hand, meat and most other animal foods are completely digested within the stomach, when stomach acid is adequate. If it’s not, then yes, it can pass by undigested into the colon. But if this is the case, a plant based diet wouldn’t solve anything, as there likely isn’t adequate stomach acid to completely digest the digestible parts of the plant foods, either.
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