I am a 17 year old female. I want to loose some weight safely. I lost 10lbs over a period of two months. I wanted to speed up my weight loss by taking green coffee bean extract. My question is (1) is it safe, (2) is it effective, and (3) when I am done loosing weight and stop taking the green coffee bean extract, will the weight immediately come back because I am not taking the supplement anymore? So if I stop taking it, will there be any negative effects such as gaining weight back suddenly? Thanks.