We basically have to relearn all that we've forgotten about tradiational diets, which were varied, and generally poor in animal protein. Around 1800 the "modern" versions of "traditional" dishes arose, which were highly enriched in their animal content. Where a stew would have had a little meat for flavour, it now consists mainly of meat and so on.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman