Fat burners are thermogenic in nature, which essentially means that they increase the production of heat in your body. This leads to metabolic stimulation and therefore, greater calories burned throughout the day. Since the key to weight loss is to burn more calories than you consume, a fat burner can greatly aid in achieving this by increasing the rate at which you burn calories. This is achieved through the use of proven, natural fat loss ingredients such as green tea and coffee extract, as well as naturally occurring amino acids such as L-Carnitine which helps to reduce fat storage by oxidising fatty acids and utilising them as immediate energy. Fat burners are therefore an awesome supplement for speeding up fat loss in conjunction with a well-balanced nutrition program.