It seems to all depend. I lose weight pretty quickly at the beginning of a flare, but as the flare continues I usually even out. It is always hard to show people how sick I am when I stop losing the weight. My problem is no matter how much I eat, I never seem to gain weight. I am usually pretty good when it comes to eating when in a flare, so that maybe part of it. I don't think weight loss or gain is not the best indication of a flare. Pay attention to your other symptoms you know you best.