birth control
"Had this for 7 months and just got it removed.  Didn't have a period on it the whole time, which was awesome.  However, I gained about 8 lbs while I was on it, and tried to lose the weight that I gained and could only do so by pretty much starving myself and exercising over an hour every day, and even then I only dropped about 4 lbs.  Considering I only had this 7 months, I'd hate to see how much weight I would've gained if I stayed on it any longer."