I don't think so.
The best way to loose weight safely is to just cut out fatty foods, and things you dont REALLY need such a crisps, chocolates etc.
I lost 5 lbs in one week eating cerial for breakfast with semi or skimmed milk�cerial such a weetabix (as this helps digestion) with fruit such a grapes (not bananna as this is hig in carbs)�for lunch, brown break with sliced white meat or ham woth plenty of salad and water to drink with some fruit.
then for dinner, steamed fish/chicked with salad or veg..try and cut out big amounts of potato, but if you do have potatio have a jacket spud.
no sauces such as mayonnaise etc�
drink plenty of water..and dont snack of crips & choccie�.snack on fruit, rice crackers or low fat yoghurt. that was 5 lbs on one week, without excersie! imagine how much more i could have lost in that week with some gentle excersice!!!!!
hope this helps.