My body sure agrees on avoiding dairy. I suppose I'm mildly lactose intolerant, but once I stopped eating dairy I started feeling a lot better. Less gas if nothing else.

Anecdotal for sure but most of the people I know who take diet seriously agree that dairy is bad.

I also believe the saying that humans are the only animals that drink milk after infancy.

We're also one of the few animals to actually prepare our food, too. Does that mean we shouldn't do it?

Cooking just denatures the proteins. It doesn't change that much. And highly processed food is indeed worse than fresh food.

Some anthropologists think cooking changes everything--that the invention of cooking was a vital step in human evolution: http://harvardscience.harvard.edu/culture-society/articles/i...

Fermented dairy products, e.g. yogurt, kefir, are usually fine even if you're lactose intolerant. They're also high in protein and help maintain healthy intestinal flora.

Some cows quite successfully milk themselves.

Not 'everyone' agrees but most experts seem to.