We get our calories from three main sources: carbohydrates, protein, and fat. But are all of these calories the same? According to the laws of thermodynamics, the answer is yes. However, the way the body breaks each type of calorie down and the subsequent effect those calories have on the body differs. Learn why it’s important to include all three macronutrients – carbohydrates, protein, and fat – in your diet.
Lisa Fleming is a professional Health Coach who is certified by the American Council on Exercise (ACE). She is the author of "Exercising Mom." She lives in Virginia with her husband and three children.