Got Put On Meds And Didn't Become A Whale. See How I Did It! Got put on anti-depressants by my morbidly obese psychiatrist about two months ago. She said "most common side effect is weight gain" and I said "oh, I'll just eat the amount I normally eat so I won't gain weight. Thanks for the meds." I am the exact same weight as when I went in two months ago.