Comparison of Megestrol and/or Omega-3 Fatty Acid-Enriched Nutritional Supplement in Treating Patients With Cancer-Related Weight Loss and Lack of Appetite

RATIONALE: Megestrol and /or an omega-3 fatty acid-enriched nutritional supplement may improve cancer-related weight loss and lack of appetite. It is not yet known whether megestrol alone, an omega-3 fatty acid-enriched nutritional supplement alone, or a combination of both is most effective in treating cancer-related weight loss and loss of appetite. PURPOSE: Randomized phase III trial to compare the effectiveness of megestrol with or without an omega-3 fatty acid-enriched nutritional supplement to that of the omega-3 fatty acid-enriched nutritional supplement alone in treating patients who have cancer-related weight loss and lack of appetite.