求翻译：Researchers are only now starting to pay attention to the importance of friendship and social networks in overall health.A10-year Australian study found that older people witn a large circle of friends were 22 percent less likely to die during the study showed an increase of nearly 60 percent in the risk for obesity among people whose friends gained weight.And last year,Harvard researchers reported that strong social ties could promote brain health as wo age是什么意思？

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