Having a healthy heart is a struggle for many Americans thus many scientists are looking to other cultures who have low numbers of heart disease to help determine the contributing factors to heart disease development. A newly studied group of natives in the Amazon are believed to have the healthiest hearts in the world. Their lifestyle of hunting, foraging, fishing and farming has resulted in a very low prevalence of atherosclerosis, or hardening, of the arteries and heart disease. Scientist suspect their active lifestyle which consists of a lot of low-intensity sustained exercise helps them keep their weight in check and reduces the many risk factors for developing heart disease that the American population faces.
Read more here. http://www.npr.org/sections/goatsandsoda/2017/03/21/520565500/who-has-the-healthiest-hearts-in-the-world