There is no such food that you can eat and loose weight really fast or very instantly.Some foods do help to loose weight but their effects are seen in long term.These foods are-lukewarm water with lemon and that too effects if taken regularly after every meal.
*foods rich in fibres like salads,fresh fruits,whole grain cereals and pulses,sprouts.
*lauki juice early in the morning also helps as it reduces hunger pangs.