The study found that the rate of heart attack in those who consumed fish oil was 28% lower compared to those taking fake medications and increased the risk of 77% among African Americans. But the large study group said a large percentage needed to be confirmed.
Joan Manson, head of preventive medicine at Brigham & Wyman Hospital in Boston, said the cancer death rate among those taking vitamin D was 25 percent lower. "This may be due to the fact that this vitamin can affect the vital structure of the tumor, which reduces the possibility of spreading to other areas of the body."
"So we can see a reduction in cancer mortality, but it's not a reduction in the initial diagnosis. It takes a longer study … If we talk about cancer prevention, it can take treatment for more than a decade," she said .
The new study was published online in the New England Journal of Medicine. Most of the previous research has focused on volunteers who are already at high risk for a heart attack, stroke or cancer.
The study included 25,771 participants aged 50 years, and none of them had a heart attack, stroke or cancer before, more than half of them followed the study for more than five years.
"Those who are taking vitamin D or fish oil already feel that there is nothing to stop them," said Manson. But some may want to wait until more results are published about the relationship of these supplements with diabetes, cognitive function, depression, and autoimmune diseases over the next six months to decide whether the benefits are worth dealing with, she said.
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