You probably already know why you are overweight. The causes of overweight or obesity naturally differ from individual to individual. Basically, you will gain weight if your calorie intake (food eaten) is higher than the calories you use through exercise or normal activity.
Its all governed by this basic equation:
calories in - calories out = weight gain
The important thing to remember is its not the absolute quantity of food you eat that’s important for weight control. Its the difference between what you eat and what you use.