[kossTKR]

It's not just as simple as "probably just meat". Of course meat is important but i'd say in light of recent research fermentation and gut flora related concepts would be a better guess.

Cutting edge research into the Gut Biome shows its overlooked significance, connected to pre and probiotics and food, but also mental health, even going as far as questioning how much of "us" are really the gut biome.

People can heal various ailments even mental disease by getting transplants, it's a completely new and wild field of study, and holds much more weight than say eating or not eating meat.