Below is a paragraph from a blog called Primal Meded.  I recommend reading the whole post.

I don’t care whether you believe in God or Mother Nature: neither are stupid enough to provide us with natural foods that need industrial-strength modifications and pharmaceutically-supported supplementation just to make them edible. Humans are the only species on this planet which require multi-million dollar investigations to tell them what to eat. Because clearly after 2 million years in existence we clearly still haven’t worked it out.

You can get to the post here:
http://primalmeded.com/2011/06/15/natural-my-a/