Cachexia is what happens to late stage cancer patients who cannot eat. I don't know if that is the right term. I sure felt like I looked anorexic at teh end of my treatment and while Iw as transitioning to solid food again. I have ot be careful when I get busy/stressed that I take enough time to eat otherwise I lose weight.

The loss of appetite taste and eating function and the difficulty in getting these all back are what causes the weight loss. Anorexia is when someone deliberately starves themselves to lose weight.