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Study: Women's brains appear three years younger than men
Women tend to outlive men and stay mentally sharp longer, and a new study out could explain why: female brains appear on average about three years younger. The study enrolled 121 women and 84 men, who underwent PET scans to measure brain metabolism, or the flow of oxygen and glucose in their brains.
Like other organs in the body, the brain uses sugar as fuel. But just how it metabolizes glucose can reveal a lot about the brain's metabolic age. Subjects ranged from their 20s to 80s, and across those age spans, women's brains appeared metabolically younger than men's, said the findings in the Proceedings of the National Academy of Sciences, a peer-reviewed US journal.
A machine-learned algorithm showed that women's brains were on average about 3.8 years younger than their chronological ages. And when compared to men, male brains were about were 2.4 years older than their true ages. "It's not that men's brains age faster," said senior author Manu Goyal, assistant professor of radiology at Washington University School of Medicine, St. Louis. "They start adulthood about three years older than women, and that persists throughout life," said Goyal.
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