You might wish to try some of the same things I recommend to cancer patients to help combat cachexia:
N-Acetyl Cysteine (NAC), can help prevent cachexia and is considered an essential complimentary supplement to oleander in general. Other items that may may help combat cachexia are coconut oil and especially Garden of Life's Primal Defense, a natural blend of 12 species of probiotics and Homeostatic Soil Organisms (HSOs). It helps support normal gastrointestinal balance of good and potentially harmful bacteria, and maximizes the benefits of a healthy diet by supporting normal absorption and assimilation of nutrients in the gut.