Another way to look at it is with depression you probably exercise very little due to lack of energy. With the medicine you have more get up and go.

I am on welbutrin right now. I don't think it causes weight gain. I've heard it and effexor can actually make some lose weight because the added energy. the effexor when I tried it made me sick so I couldn't eat for a day, then was eating too much the next day trying to settle my tummy down.