oh good gawd relax Veg Nazi The problem is the over-processing of food. You think animals that eat other animals that are high in animal fat (ex. what polar bears eat) are dying of pancreatic cancer?
The farther you take a food item from nature, the less beneficial it is to you. A factory farmed, caged cow fed a crap diet, medicated every day of it's life then slaughtered inhumanely and it's meat soaked in whatever the hell people are eating for Sandra Lee's marinade o' horror. Is about as far from natural as you can get.

Humans are omnivores, our bodies are built to deal with almost anything. Everything in moderation.