There is a really good book out right now called "Healthy at 100" by John Robbins that speaks to this very subject. It looks at several cultures that tend to h

There is a really good book out right now called "Healthy at 100" by John Robbins that speaks to this very subject. It looks at several cultures that tend to have a larger % of HEALTHY centenarians, such as the Okinawans and Hunzans. It looks at what they eat, how they live, etc. It is good because he acknowledges the self-reporting errors in such studies ("Yeah, dude, I'm 110 years old!") and the impact of physical activity and social bonds on longevity, etc. John Robbins is biased (toward vegetarianism/veganism), but his bias is based on sound principles (science, self-experience, environmental impact, ethics, etc.) The book is not preachy or anything, though. His other books are also really good. Especially if you're interested in the food industry, animal cruelty, nutrition and disease, etc. He's a very interesting guy. He walked away from the Baskin-Robbins fortune to live a simpler and healthier life after his dad and uncle (Robbins and Baskin, respectively) both died of heart disease from eating too much of their own product. His one room, self-built cabin with second-hand furniture was featured on "Lifestyles of the Rich and Famous" and it became one of their most requested shows, to everyone's surprise. He's a pretty inspiring guy.