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Eating fish may lower your heart rate and reduce the risk for sudden death from cardiac arrest, according to a 10-year study of 9,758 men ages 50 to 59. The omega-3 fatty acids found in cold-water fish, such as salmon, tuna and mackerel, may prevent the deaths by regulating heartbeat and preventing the irregular heart rhythms associated with sudden death. The study was published in 2003 in Circulation: Journal of the American Heart Association.