Your metabolic rate is the rate at which your body processes nutrients into energy, and it's important for it to function well. The metabolism affects the functions of the entire body. If you have a healthy metabolism that burns fat quickly and regulates body functions accurately, more than likely you have fewer problems with your body image, have energy to do normal daily tasks without tiring easily, and have healthy, sharp brain function. However, a person with a slow metabolism, is more prone to be overweight and is open to more health problems. Having a healthy metabolism is very important.