birth control
"I started this medication when I was 15 because I had extremely painful, irregular, and stressful periods. I never knew when it would start or end, and I almost always had to miss at least one day of school per period. It sucked.
When I started this medication, I did notice some spotting for the first month of use. I then had my period and I never spotted again! 
It's been three years since I started this medication, and I've only gained 5 pounds in that time, so I'm assuming it's unrelated to the medication. I have not noticed any cravings, mood changes, or acne while on this medication."