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Omega-3's and heart health
Doctors wanted to test if the lower rates of heart disease in Japan are due to genetic factors or to consuming more omega-3 fatty acids from fish than do Americans. In the study, researchers measured coronary artery calcification in 175 Japanese men and in 113 American Caucasian men. All the men began the study with zero calcification.

After an average of 6.2 years of follow-up, about 1 percent of the Japanese men had developed calcification compared to 3 percent of American men. Researchers took into account differences in chances for heart disease and concluded that U.S. men had three times the rate of calcification as Japanese men, who consumed 100 percent more marine omega-3s than their American counterparts, or about 4 ounces of fish per day. Doctors concluded that the vast difference in heart disease between Japanese and American men is not due to genetics, but to greater consumption of omega-3s.

Reference: Heart. 2014; 100(7): 569-573.
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