A method of treating disease-related cachexia comprises administering to a subject a composition comprising an anti-AGE antibody. A composition for treating disease-related cachexia comprises a first anti-AGE antibody, a second anti-AGE antibody and a pharmaceutically acceptable carrier. The first anti-AGE antibody is different from the second anti-AGE antibody. A method of treating or preventing the onset of disease-related cachexia comprises immunizing a subject in need thereof against AGE-modified proteins or peptides of a cell.