Rant: Bith control and weight gain Posting from mobile. I was so scared to start birth contol because I heard horror stories about how it made girls gain so much weight. I am a pretty fit person so I just did not want to take this chance. Finally, I had a talk with my doctor and he said the only reason for weight gain would be because of an increased appetite and just endulging in massive amounts of food because of it. So all those hammies were just blaming the birth contol so they could eat more. Actually I have lost some weight because I am watching what I eat more. So moral of the story, the hammies almost got me pregnant because they made me terrified to get on birth contol.