2. Beat cancer
Regular use of fish oil supplements was associated with a 32 percent reduced risk of breast cancer in a study of 35,000 women, reported in the journal Cancer Epidemiology, Biomarkers & Prevention. A Harvard study found that men who ate fish more than three times a week cut their chances of developing advanced prostate cancer by 40 percent. The main cancer-fighter is probably omega-3 oils, but generous amounts of vitamins A and D may also help.