bipolar disorde
"I've read many people have been gaining weight from this drug.  This is why it is SO important you care about your health from day one and it should be a part of your lifestyle and regimen, no matter what.  This way, whatever the side effects are of the medicine, you're on top of your game and won't get hit as hard.

I've been on many bipolar medications which make you gain weight, but I barely noticed because I work out and eat very healthy.  It's of utter importance that you lay down a solid, healthy foundation before and during therapy.  The healthy lifestyle will also make the medicine work better.  It's common sense."