I agree with Mel - losing weight is hard! So if you see an ad for a product that will let you 'lose weight while you sleep/bath/watch TV' then it's going to be pretty enticing. Most are scams though - like the diet pills that, if you take them in conjunction with a healthy eating plan and regular exercise, you'll lose xkg in a month
. And while a lot of fad diets do help you to lose weight in the short term, they're impossible to maintain so you go back to 'normal food' as opposed to 'diet food' and put it all back on.