I am not an expert, but I was on the birth control pill for 12 years. I ate healthy, I love working out, but I never lost the 15 pounds that I gained when I went on the pill. Since going off the pill, I realized it wasn't just water, because I had an increase in appetite, I had to lose fat, not just water. I wouldn't recommend the pill to someone who doesn't want to gain weight, as in fat because that is exactly what happened to me (I also tried very type of pill and nothing changed).