I don't know of any studies, but we are equiped to process meat, as has been pointed out earlier in this thread. We have the digestive system to handle it, and we have the dental equipment to chew it.
And well yea, it could be a taught thing. But then again, humans as a race have reached a point where everything needs to be taught. If you were to keep a baby in a concrete bunker, feed it trough a hospital tube and stuff, 18 years later it wouldn't know anything about having to eat something using their mouth. At least, thats what I think.
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