I gained a lot of weight on Zyprexa, but I went from not eating at all to snacking a bit too much while not exercising at all. I went from a BMI of 16,5 to one of 26,7.

While tapering off I lost the weight without trying (even though I started on Clozapine while tapering off the zyprexa, which is supposed to be an even more notorious weight gainer than zyprexa) and now I have a healthy BMI (21,5).