Our bodies produce energy by using three important macronutrients: carbohydrates, fats, and protein. However, protein is the most unique of the three because it fuels muscle growth. Skeletal muscles are the prime burners of energy within the body; and it can still burn energy even at rest. People who have adequate lean muscle mass have a high-functioning calorie-burning machine that burns their energy twenty-four hours a day. However, you do not need to spend endless hours lifting weights and building your muscles to get this effect. Researchers reveal that improving your muscle mass even just a bit more can significantly increase your metabolism.