an interesting article from the current issue of "Harvard Magazine"
that discusses America's dietary habits, including a short discussion
of Wrangham's research indicating that humans are naturally adapted to a
cooked food  diet:

http://www.harvard-magazine.com/on-line/050465.html

and here's a supporting/background article on Wrangham's research
from an earlier issue:

http://www.harvardmagazine.com/on-line/1100110.html

PS Some raw vegan advocates have attacked Wrangham's research -- even though
it appears that they haven't even read the published journal articles! This
intellectually dishonest practice is standard behavior for some raw vegan
promoters, in particular the raw vegan pseudoscience fakes. (Many of the
raw vegan pseudoscience promoters have no credentials or training
whatsoever in science - keep that in mind when you read their claims.)

Tom Billings