Loss Weight, How?

How to lose weight? I haven’t tried losing weight, I have not been into diets and I have not tried any weight loss pills. But I have a lot of friends who have weight problems and I believe they really need help.
There are weight loss pills available over-the-counter and there are also available upon a physician’s prescription. But if I would be the one who’ll take it, I’d rather ask my physician first because I would love to know the pro’s and con’s about it. Checking out http://www.shoppharmacycounter.com/t-Adipex-Medicine.aspx made me realize that all diet pills really needs to be prescribed.