ISLAMABAD- Supplementing diet with fish oil may prevent muscle and weight loss that commonly occurs in cancer patients who undergo chemotherapy. The process can cause cancer patients to lose muscle mass and become malnourished, leading to fatigue, a decreased quality of life and shorter survival. Researchers believe that supplementing the diet with fish oil which contains omega-3 fatty acids can help patients maintain their muscles. Patients, who did not take fish oil , lost an average of 2.3 kilograms whereas patients receiving fish oil maintained their weight, according to an Alberta University release.