i do agree it is about an overall lifestyle change - once you've lost the weight, so i understand the need to kick-start weight-loss when you are overweight with a diet where you feel in control of your relationship with food.
it's great to eat 'healthy' portion sizes etc when you are the weight you want to be as you generally will have a more positive outlook on yourself, your body and your food, so it's not as difficult to do this. but the reason you (and me!) are overweight in the first place and not happy is that portion sizes are not currently healthy nor is the food, so i find it a bit frustrating when people just say oh, diets are bad, just don't eat as much. it's not that simple otherwise nobody would be overweight! so yes, people go on diets and then revert to their bad habits and put on the weight they lost, but the trick is to NOT go back to old habits once you have reached a weight you are happy at.
phew, didn't mean to write so much, but there you go, just my opinion.
FWIW, i am currently low carbing, as I have 3 stone to lose, and I'm pleasantly surprised with the fact that you generally do lose all your snacking and (most importantly for me) sugar cravings very quickly due to your insulin being so stabilised on the high protein foods you're eating which makes sticking to it longer term - if you have lots of weight to lose like me - more manageable. Plus, you don't feel like you're on a 'restrictive' diet because if you're ever hungry, you eat until you are satisfied, just as long as it's protein.