I'm 20 year old girl, weigh 132 pounds, and i'm 5'6. I exercise (cardio and lifting light weights) about 2-4 times a week, depending on my schedule. I want to weigh 125 pounds and have been thinking about taking diet pills to help because I can't seem to lose more weight. Is it a safe idea? I've heard rumors of girls my age taking diet pills, and later on in life are overweight and can't lose the weight because they ruined their metabolism. Is this true?