Older adults who had the highest blood levels of omega-3 fatty acids, most commonly found in fish, were 30 percent less likely to later develop an irregular heartbeat than peers with the lowest blood levels of omega-3s, according to a U.S. study. Up to nine percent of U.S. residents will develop atrial fibrillation by the time they reach their 80s, according to some estimates. The heart rhythm abnormality can lead to stroke and heart failure.
