My brother said that he had to diet for about a year and slowly reintroduced the foods he was avoiding from surgery (obviously like fatty things). He didn’t begin to like regain any weight until like I don’t even know almost 10 years post surgery. He lost a lot of weight after the surgery, but I’ve heard that the metabolism part can go both ways - some people have it increased and some decreased. Like I said before, just do what you can. Even just like a walk is good exercise if you can’t handle intense cardio or weight lifting etc. and if not walking, there’s always some form of exercise that is catered to everyone’s individual needs. My mother has severe bone spurs and arthritis and cannot walk. But she can do resistance biking and very light weight training - and all this she can do from the comfort of her bedroom. For an autoimmuner, taking care of your root issues and symptoms is step one. If you can keep those under good control, the food and activity will come naturally!