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Weighing in on vitamin D and omega-3 fatty acid supplements

A five-year study of dietary supplement use in nearly 26,000 participants found that omega-3 fatty acids reduced heart attack rates by 28 percent but did not affect risk of stroke or cancer. Within the omega-3 group, reduction of heart attack risk was especially pronounced among Blacks, who made up 20 percent of the total participant pool. Although vitamin D did not significantly affect heart attack, stroke, or cancer incidence, it was linked with a 25 percent decrease in cancer deaths. The decrease began one to two years after participants began taking the vitamin. The study was conducted by HMS researchers at Brigham and Women’s Hospital.

Manson JE, et al., The New England Journal of Medicine, November 2018

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