The Tsimane are an indigenous individuals residing in Bolivia close to the Amazon rainforest, that also observe their conventional life-style, a mixture of looking, gathering, fishing, and subsistance farming. They’re very energetic, and eat a nutritious diet consisting of a giant proportion of complete plant meals, about 15% animal merchandise, and virtually no “junk” (fashionable overly processed meals). They made the information a few years in the past after they had been discovered to have the lowest incidence of coronary artery disease of any inhabitants ever studied. Now it’s been found they’ve wonderful mind well being. Particularly, their brains don’t lose they quantity with age as typical adults in fashionable societies do.
One of many research authors, neuroscientist Andrei Irimia from the College of Southern California, stated “The Tsimane have offered us with a tremendous pure experiment on the possibly detrimental results of contemporary life on our well being. These findings recommend that mind atrophy could also be slowed considerably by the identical life-style components related to very low threat of coronary heart illness.” 
The nice coronary heart and mind well being is although, with out entry to fashionable drugs, the Tsimane have a comparatively excessive fee of systemic irritation attributable to infectious illness. People who make it to maturity can count on to reside to 70 years of age. Their longevity would most likely be a lot higher in the event that they could possibly be protected against infectious illness.
1, Dockrill, P, “‘Wonderful Pure Experiment’: In This Amazonian Tribe, Brains Don’t Age Like Ours”, Science Direct, 2021 (https://www.sciencealert.com/amazing-natural-experiment-in-this-amazonian-tribe-brains-don-t-shrink-like-our’Amazing Natural Experiment’: In This Amazonian Tribe, Brains Don’t Age Like Ours)