Fat is storage of calories in a human body. Whatever a person eats contain certain amount of calories. The body uses as much calories as it requires, depending on the amount of physical and mental work a person does in a day. Any amount of excess calories that remain unused by the body is stored inside the body in the form of fat, to be used by the body at the time of emergency.

So you see, eating more than necessary leads a person to become fat or obese. So, you have to reduce your intake of calories every day and calculate carefully your calorie intake by calculating the calorie value of every food you eat. You can start by reducing 500 calories per day initially to lose your excess body fat. You may be able to lose about one pound of your body weight in a week. You can cut about 1000 calories in a day to lose about two pounds of your body weight in a week. It all depends on the existing situation. But everything must be done under expert medical guidance and supervision.