Welcome to the last post in the series. Time to summarize and wrap it up!
Respect
I respect each person's right to choose the diet they prefer. This includes vegetarians and vegans, particularly because most of them make daily sacrifices to try to make the world a better place for all of us. I'm an omnivore, but I sympathize with some of the philosophy and I often eat beans or lentils instead of meat*.
Our history with meat
Our ancestors have probably been eating some form of meat continuously for at least two hundred million years. However, the quantity has waxed and waned. The first mammals were probably largely carnivorous (insectivores). Yet our primate ancestors went through a 60-million-year arboreal phase, during which we probably ate fruit, leaves, seeds, insects, and perhaps a little bit of vertebrate meat. We only outgrew this phase in the last few million years, when we developed the tools and the brains to pursue prey more effectively.
During our 2.6 million-year stint as hominin hunter-gatherers, we ate an omnivorous diet, although we really have very little idea how much meat it contained (it probably varied by time and place). Historical and contemporary hunter-gatherer cultures are all omnivorous, and typically eat significant to substantial quantities of meat, suggesting that our ancestors may have done the same. Non-industrial agricultural populations eat as much meat as they can get, although they usually can't get as much as hunter-gatherers.
If there is such thing as a natural human diet, it is clearly omnivorous.
Meat, obesity, and chronic disease
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