I'm not sure this is really a secret anymore. BUT... most people still think it's a cop-out / "cheating" to lose weight. All I know is the "95% rule". For normal dieting, of those who have to lose a considerable amount of weight, 95% will fail to do so. With surgery, 95% succeed.
Which 95% do you want to be? For me, I tried dieting and exercise more times than I could count. Always lost the weight; always put it back on (and then some). Since my Lap-Band, I've lost 160+ pounds and have not gained a single pound back. Not a secret, but more people should consider it!!