"A large percentage of people aged between 20 and 60 have a rise in blood pressure and by middle age many have high pressure, " said a professor of preventive medicine who took part in the study.
Dr. Jeremiah Stamler, of Northwestern University in Chicago, went on, "We're looking at dietary factors that may help prevent that rise, and omega-3 fatty acids are a small, but important piece of the action." The study looked at diet and its relation to blood pressure in 4,680 men and women aged 40 to 59 and living in Britain, Japan, China and the United States.