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Add this to the approximately 8 billion benefits of omega-3 fatty acids: They could help preserve DNA segments known as telomeres, whose degradation is a key marker of aging. Shorter telomeres are associated with age-related decline, cancer and a higher risk of death (in one study of people over 60, those with shorter telomeres were three times more likely to die from heart disease and eight times more likely to die from an infectious disease). But according to Ohio State University scientists, taking omega-3 fatty acid supplements (such as fish oil pills) can help lengthen telomeres in middle-aged and older adults.