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Research Confirms a Link between Intelligence and Life Expectancy – Scientific American.

People are living longer than ever. According to a 2015 World Health Organization report, Japanese live the longest, with an average life expectancy of 84, while Americans can expect to live to 77. At the same time, it is an obvious fact that some people live much longer than other people. There is inequality in mortality.

What explains this inequality? Epidemiological research confirms what intuition suggests: lifestyle matters. A 2012 study published in Preventive Medicine followed over 8,000 people over a 5-year period. Risk of death by any cause was 56% lower for non-smokers, 47% lower for people who exercised, and 26% lower for those who had a healthy diet. Italian researchers analyzed the diets of inhabitants of the Monti Sicani region of Sicily, where there is a remarkably high prevalence of people who live to be 100. Along with being physically active and having close contact with relatives, the centenarians surveyed were found to adhere to a traditional Mediterranean diet.

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