Everyone dreams of eating everything that they want and never get fat at all. That would definitely be the day when everybody could finally give up strict diet routines. The main idea in burning fat is to increase the rate of your metabolism. When you are still young, your body is really active and your metabolism is always at its peak. But when you get to a certain age, metabolism slows down.Â When this happens, all that you eat just stays stagnant in your body and never gets used by your body for energy.