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Originally Posted by Sadsack Actually, humans and most vertebrates are unable to break down cellulose because they do not (and never did) have the enzymes to accomplish this. Some animals have certain flora in their digestive tract that can partially break it down, but not humans. Some lightly cooked vegetables are necessary in the diet because the cooking process makes the nutrients more bioavailable. Soups or other ways of consuming the nutrients leached out are best; steaming is also preferable.
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I guess this could be true through adaptation of when fire was discovered and they started the George Foreman Grill club. I don't know the history of any of this, but I was always of the mindset that if it was put on earth for human consumption raw, we would be able to digest and absorb the nutrients. I'm sure other factors come into play, and I'm thinking what you say about cellulose not being digestable in humans is correct (roughage).
Kritts