After thirty years or so of RA I am no longer surprised at the things it causes. I have been subject to both weight gain and wight loss due to the RA and its surrounding effects. A lot of times when I am going through a flare-up, it may not cause weight loss directly but since I just feel like crap and a bit nauseous it just makes me not eat and causes weight loss as a secondary effect. Also, some of the medications I took had a side effect of curbing the appetite. There are so many ways RA can affect your weight that I wouldn’t be surprised, frankly. Let us know if there’s anything else we can do to help and check out that article that Richard recommended! Keep on keepin’ on, DPM