@ Malvika
It very simple, By adding more of fibers food, fat burning foods & protein foods in ur diet.
i) Protein is the muscle builder activator and the natural fat burner. So include more of protein foods like skimmed milk, low fat curd, lean meat, egg white, fish, nuts, whole grains, dals, etc.
ii) Fiber plays a roll in losing belly fat: Fiber foods are all green leafy vegetables, vegetables, whole grains, etc.
iii) Fat burning foods which is vitamin C is more effective for burning the belly fat.