> Kitavans didn’t even seem to gain weight in middle age. In fact, BMI was found to decrease with age. Many lived into their 80s or 90s, and Lindeberg even obse

> Kitavans didn’t even seem to gain weight in middle age. In fact, BMI was found to decrease with age. Many lived into their 80s or 90s, and Lindeberg even observed one man who he estimated to be 100 years old. None of the elderly Kitavans showed signs of dementia or memory loss. The Kitavans also had no incidence of diabetes, heart attacks, stroke, or cardiovascular disease, and were unfamiliar with the symptoms of these diseases. “The only cases of sudden death they could recall,” he reports, “were accidents such as drowning or falling from a coconut tree.” Maybe it's survivorship bias? Without modern medicine only healthiest people survive to adulthood so later they live long healthy lives. In modern society these people would be healthy too, but they would be a small percentage of the whole society. This would also explain why domesticated animals show similar problems. Because we keep them alive :/ And then since it's at least partially inheritable - the effect would compound with each generation. With unsettling implications.