Do you know what a metabolism is? It is the rate your body uses calories just to maintain itself. Some people have higher metabolism rates than others, but why? One of the simplest ways to explain it is that muscle tissue uses more calories than fat does. So the more muscle versus fat you have on your body the more calories your body can use without it turning to fat. The top fat burners will be bodybuilders and those in physical competition.
There is a BIG bonus for those people with more muscle and very little fat on their bodies.....they can often eat lots of calories and not gain any weight. That is because their muscles are using the calories right away. Most bodybuilders will often consume 5,000 calories a day or more., where as the average person will only need 1500 to 2000 calories a day.