A great book is "Nutrition and Physical Degeneration" by Weston Price. Humans should indeed eat according to their zone, but on the spectrum of carnivore to vegan, the most virile primitive races were omnivore or carnivore.
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Thanks for the rec! I’ve been meaning to read this for a year or so.
I’m a big fan of Nourishing Traditions, by Sally Fallon Morell, President of the Weston A Price Foundation. You probably have it, but if not, I highly recommend as well. Great #bookstr 
I love that book. I read everything except the recipes, cover to cover, about 5 years ago. There's a lot of good information in there.