Increased consumption of fish oil (such as from eating fish) may help slow the progression of atherosclerosis, thereby preventing heart attacks, and reduce the risk of sudden death due to cardiac arrhythmias. These effects seem to have received further support from a 14-year study of generally healthy older people (average age of 74).  The prospective cohort study published in Ann Intern Med. 2013 concluded that higher circulating individual and total ω3-PUFA levels are associated with lower total mortality, especially CHD death, in older adults.