My weightloss was because of the MG - the muscles in my jaw & esophagus were severely effected when I first developed the condition. I just couldn't swallow very well and became fatigued chewing. Eventually, the stomach shrinks and you get filled up really quick making it even harder to get nutrition into you.

Ensure, Nestle powdered breakfast and one other that I cannot think of off the top of my head were consumed in large quantities... the Nestle powdered breakfast is not bad tasting actually but any of those shake meal replacements gets pretty gross if that's all you're getting into you.