Women who include fatty fish -- salmon; herring; mackerel; lake trout; sardines; albacore tuna and seafood such as prawns, lobster, crayfish -- more than once a week into their diet significantly decrease the risk of developing kidney cancer, according to Karolinska Institutet researchers.

This is the conclusion of a 15 year study of 61,433 women who reported their eating habits of including fatty fish versus leaner fish. Fish classified as leaner fish are cod; haddock; hake; pollock; sole; turbot; dogfish and shark.

Lean fish does not appear to offer any cancer prevention benefit. However, fatty fish offers high levels of omega-3 fatty acids and vitamin D, which are considered important in functional food cancer prevention.

While this study focused on women partipants, it makes common sense that including fatty fish in more than one meal a week would benefit men and children as well. The study will be published in the Journal of the American Medical Association. The abstract, Long-term Fatty Fish Consumption and Renal Cell Carcinoma Incidence in Women, is available now.

University of South Australia researchers have good news for people trying to lose weight, or maintain a healthy weight, in improving their health and reducing their risks for diseases like cancer. With no other lifestyle changes, taking omega-3 fish oil supplements and engaging in moderate exercise helped people struggling with weight issues -- who are overweight or obese -- effectively burn off extra pounds.

The researchers used tuna oil and sunflower oil in the study, and compared the effects of the two oils with exercise to weight loss results. The participants engaged in exercise that is considered moderate exercise -- walking or running for 45 minutes -- three times a week for three months and were given either tuna fish oil or sunflower oil. The participants who were given tuna fish oil lost weight faster.

The researchers believe that fish oil, which is rich in omega-3, helps the body burn fat, and estimates that most people do not get enough omega-3 in their daily diet. Omega-3 is also found in wild salmon, flaxseed, and certain nuts and seeds.