What is, and is not proper nutrition, is incredibly simple. Yes, modern folks have made it very complex and confusing. But the proper nutrtion for animal life is very basic. For millions of years man ate about the same thing day in and day out. It mattered little as to where he was on the planet. His diet was based on the green leaf just like the rest of the animal kingdom. Always at the bottom of the food chain there was the green leaf whether it was in the sea or on land. But about 10,000 years ago man started changing his foods with the invention of agriculture. Today, the bottom of his food chain is seeds, nuts, and fruit. That's the problem. Those "foods" are not fit for man or beast.