It's a struggle to keep my weight up near normal because I can't eat a western diet successfully at all. My gastroenterologist told me "our *** patients are the sickest we have".
The *** being a rare condition I think is too identifying to state, but I was born with it and may end up tube fed to my heart if I can't keep eating.
I depend on chocolate and vitamin pills to supplement the rice & vegetables and keep my weight almost normal without the excruciating pain of eating much. If I cheat, have some wine for example, I pay in pain. Vaping bud eases my guts and mind but that doesn't touch my arthritis for which I get partial disability. For that I like opiates.
It's a complex syndrome and it makes opiate wd particularly tricky with a lot of rehydration salts and monitoring my weight carefully.
Being underweight is more dangerous than being overweight, but this blood I'm losing is bright red, hence OK unless it goes on too long, then I become anaemic as well as jaundiced!