Two groups of 28 patients each are randomly chosen to receive either an oral nutritional supplement (Optimune) containing increased amounts of high-quality protein (whey), which is rich in cysteine and glutamine, or an isocaloric, identical-tasting supplement without added whey protein or amino acid supplementation. Weight, body composition, anthropometry, dietary intake, and general physical health are assessed at baseline and at Weeks 6 and 12. Plasma cysteine, glutathione, C-reactive protein, and prealbumin, along with urine IL-6, sTNFrII, and IL-1ra, are assessed at baseline and at Week 12.