Fuck knows. I am properly changing shape simply by exercising. I eat a normal balanced diet, have treats, avoid supplements and meal replacement shakes, and guess what: I look better and it's much easier to maintain!
Why on earth would you spend hundreds of £££ on meal replacement shite when you can spend the same money on a good PT and a gym membership (or no PT if you aren't a lazy sod like I am) and make a real and lasting change to your health! Life's too short to diet. Eat well, enjoy your food, but manage that normally and exercise! And better still: it is totally EEEEEEK-free!