Omega-3 fatty acids from fish oils have a direct effect on biological ageing, US research suggests Fish oil may be the true elixir of youth, according to new evidence of its effect on biological ageing. Omega-3 fatty acids from fish oil preserve the genetic "fuse" that determines the lifespan of cells, say scientists. The discovery, made in heart disease patients, may explain many of the claimed health benefits of omega-3. Taking fish oil supplements is said to protect against heart disease, improve survival rates after a heart attack, reduce mental decline in old age and help to prevent age-related changes...