I am working with my doctor to figure out the joint and mucles pain. Feels like a lactic acid issue so I have been changing my juice to exclude PG, also had a suggestion to add potassium supplements. The weight gain I have gotten under control and have lost 10 lbs and have another 10 to go. I am just changing my diet to compensate.
I don't have a final answer on the real cause at this point.
I'd be interested in what you find out.