Just read the book. It should be in the library.
The basic idea is that we evolved over millions of years and our body became accustomed to our primary food sources to derive all the nutrients we need.
Those food sources over the past 80,000 years were primarily grains, greens and legumes. Only in the past 50 years have we drastically altered our diet and began consuming copious amounts of meat. The bottom line is that it's not that good for you. Especially the industrially produced meat of today.
You'd be better off health wise to get alternate proteins, like from beans and high protein grains like quinoa. Not only do you feel better, you body likes them more.
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