An average human burns up to 2000 calories by just living a day. The calories increase depending on the weight of the individual and how active they are. 3500 calories are equal to about half a KG of fat. So cutting about 500 or 1000 calories a day instead of consuming a regular 2000 or more will help you lose about 1 KG a week.

Don't starve yourself, and never stay away from your favourite food as it will make you crave it more and create stress which will make you gain weight. Eat what you like in smaller portions and make up the rest with healthy food. Control processed food and fast food and bring it within your calorie count. While 1 idly is only about 35 calories, 1 slice of white bread is about 100 calories. Calculate what you eat and keep a track of all the calories and keep it within the limit. If you consume more than your goal one day, then adjust it in the next two days.