I believe I have recommended this book before in other threads where the talk turned to what we eat and why...

Native Nutrition.

A VERY interesting look at the nutrition of indigenous peoples throughout history, and what happened when certain food items were introduced into those cultures (for example, sugar).

The author believes meat eating for certain peoples is entirely the right thing to do, and also thinks the standards governing agribusiness-raised meat are appalling; quite a good balanced attitude, I think.

Peg