I have been on Tysabri for about 9 months now but I feel like I am well getting fat. I eat a lot less than I used too and it’s healthy stuff. I am getting more exercise as well – but I am still gaining weight. I know this can be a side effect of Tysabri but what else can I do? Did anyone else feel this way? Any suggestions would be greatly appreciated, cause this is just another thing that is getting me down and making me sad!