Amazon tribe has lowest heart risk ever seen: study

Researchers said Friday they had found an indigenous Amazonian tribe with the lowest levels of artery hardening -- a portender of heart disease -- ever observed.Known as the Tsimane, the small forager-farmer community in Bolivia was five times less likely to develop coronary atherosclerosis (artery hardening) than people in the United States -- where it is a major killer, scientists wrote in The Lancet medical journal.