Plant-animal subsistence ratios

Occasionally people will assert that evolutionary nutrition should involve mostly plants. After all, they read somewhere that the !Kung eat most of their calories from plants. And their nutrition science professor said so. Or some vegan book they read. And it's politically correct, so why not?

Here are some facts

• Modern hunter-gatherers are not our ancestors. They provide an analogue to study, but most are have been pushed into marginal environments and have had varying degrees of contact with civilization.
• Some people that are used as examples of hunter-gatherers eating a healthy plant-based diet are not hunter-gatherers per se. Many, like the Kitavans, are horticulturalists.
• Many of the marginal environments such tribes live in are considered to be suboptimal and probably do not correspond to our ancestor's environments. For example, many of these supposed hunter-gatherers live in forest environments that anthropologists aren't sure can even support true foragers.
• Methods for measuring diets are often inaccurate. After all, there aren't many nutrition labs in rural isolated Tanzania. Some redos of studies have shown calories from plants were initially over-estimated.
• There is ample anthropological evidence that hunter-gatherers studied prize meat above all other foods and would eat more if it if they could. Which they often can't because of poaching/overhunting/being pushed into poor environments.
• EVEN WITH all these major differences between modern hunter-gatherers and our ancestors, a survey of the available evidence done by Cordain shows that "Most (73%) of the worldwide hunter-gatherer societies derived >50% (56–65% of energy) of their subsistence from animal foods, whereas only 14% of these societies derived >50% (56–65% of energy) of their subsistence from gathered plant foods." Zing. 

I think plant pushers are either trying to be politically correct or relying on outdated info (or sources that rely on outdated info). For example, Boyd Eaton has revised his views on the subject.

Besides, find me a plant food that even rivals the best meat...it's pretty hard. I love vegetables, think they are important, but meat is the core of the paleolithic diet. You can do it with less meat if you want, but don't claim your diet is more authentic or some bullshit.

What did our ancestor's eat? We don't know exactly, but modern hunter-gatherers do not support the notion of a plant-based diet. What does? If you think you have some good evidence let me know, but since it doesn't seem like it makes a difference health-wise, I don't see a reason to advise people to eat mostly plants.