Hi nandini,
I quiet agree with swati, most of the aids which are available in the market are unhealthy and mostly very expensive. i am not in the favor of using any articial method or aid for weight loss, as even if you see the results , they are only temporary and cause a lot of other health problems. i remember one such incidence, a patient of mine went on to buy a sona belt against my advice and a week later she turned to me with all boils and burnt skin of the abdomen, a result of using the belt.. although she must have not understood the instructions well .. but there were other who did and saw no effect or just a temporary one. i feel a balanced approach is the best way out. eat a low calory but a nutritionally balance diet with adequate exercise. the weight loss done in a natural way is most effective.