(HealthDay News) -- In certain situations, competing for a mate may shorten a man's life.
U.S. researchers found that when men reach sexual maturity in settings where they far outnumber women, they live an average of three months less than males from areas with a more equitable gender ratio.
While previous studies have examined gender ratios and longevity in animals, this is the first time it's been studied in humans, according to senior author Nicholas Christakis, a professor of medicine and medical sociology at Harvard Medical School, and a professor of sociology at Harvard University's Faculty of Arts and Sciences.
"At first blush, a quarter of a year may not seem like much, but it is comparable to the effects of, say, taking a daily aspirin, or engaging in moderate exercise. A 65-year-old man is typically expected to live another 15.4 years. Removing three months from this block of time is significant," Christakis said in a Harvard news release. Read more...
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