You want to fundamentally change nature, to you its okay for a wolf to eat deer, but bad for a human to do it. Its fine a killer whales to eat seals, bad for humans too. It is the archaic thinking that we are somehow above nature when we are a part of it, and always will be.

http://history-magazine.com/potato.html

This blogger is guessing as what Aiello and Wheeler were thinking. I’ve spoken with Leslie Aiello, and I can tell you she was talking about meat and fat. And, as she told me, that’s why she and her colleague had such difficulty getting their paper published – it ran afoul of the low-carb zeitgeist at the time.

All that aside, the most simple explanation of an hypothesis is probably the most accurate. It’s a lot easier to get plenty of calories from eating animals than it is from eating plants. Early man decorated caves with paintings of hunting and animals – not potatoes and brussels sprouts – so it is fairly easy to guess what was more important to our ancient ancestors.

Plus, it takes an enormous amount of plant food to provide the calories needed for active humans. If you look up a red potato, a pretty nutritionally dense plant food, in the USDA Nutrient Database, you will find that it takes 19+ medium red potatoes to get the 3,000 calories an active human requires. The same 19+ red potatoes provide under 80 gms of protein, but it’s not a complete protein and absolutely no vitamin B12, an essential nutrient found only in foods of animal origin.

Assuming for argument’s sake that the ETH is bogus, the stable isotope analysis puts paid to the notion that early man was a vegetarian.