Why are the tribes in Africa more fit and self sufficient than the tribes in North America?

They are not fat and do not live off of the Yankees money

http://images.search.yahoo.com/images/view?back=http%3A%2F%2Fimages.search.yahoo.com%2Fsearch%2Fimages%3Fp%3Dafrican%2Btribe%26ei%3DUTF-8%26fr%3Dyfp-t-889%26fr2%3Dtab-web&w=500&h=333&imgurl=farm4.static.flickr.com%2F3169%2F3016026961_d81604b2f1.jpg&rurl=http%3A%2F%2Fwww.flickr.com%2Fphotos%2F30901396%40N07%2F3016026961%2F&size=198k&name=109+A+rivaling+s…&p=african+tribe&oid=c34575bb7e10ce5a&fr2=tab-web&fusr=Johan+Gerrit…&no=2&tt=18385&sigr=11lrspk4b&sigi=11m90k5ge&sigb=12ukii083

http://www.ajcn.org/cgi/content/full/69/4/747S

the indians in america get more benefits but it seems to backfired on them




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