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.