Epidemiological and intervention studies on the effect of marine polyunsaturated fatty acids on blood pressure.

Evidence of a blood-pressure-lowering effect of marine polyunsaturated fatty acids was examined in epidemiological and intervention studies. Data from observational studies suggest that in populations consuming diets rich in sea food, the prevalence of elevated blood pressure is low compared with Western societies. These observations were supported by results from intervention studies with fish oil supplementation to Western diets. At present dietary supplementation with fish oil concentrates should be considered experimental.