Birth control effectiveness and weight

I am pretty sure many of you out there have heard of people saying that if they take birth control, especially the depo shot, they will gain weight.  Actually, that is not always the case. But there is a link between birth control and weight.  Recent studies have shown that if the person on birth control is overweight or obese, the birth control is less effective.  More work is being done on this to find out why this might be the case.  This gives girls another reason to exercise and maintain a healthy weight! To find out more information, read this.