Your body weight will not only depend upon what you eat, but how you eat and how much amount you eat. If your body mass index is more than 24 then you are said to be obese. It is a medical condition and need immediate medical attention. If this happens you have to focus on how to lose weight. If you are really worried of about how to lose weight really really fast then you have to plan well in advance about the special diet regimen and also proper exercise.
There are also so many diet supplements which help you immensely to lose weight really really fast. Keep a log sheet about the type of food you are eating, the time and also the quantity. Each week you have to reduce the amount of food intake to the minimum food that you need for the proper functioning of the body.