How does the body use energy?
Our body needs a constant supply of energy to function. This energy is provided by food in the form of calories. Before food can actually become a usable form of energy it has to be converted into smaller units, including carbs, proteins and fats.
During exercise, your body uses some combination of all three energy types, but may emphasize the use of one over another based on the needs of your body and the type of activity you are performing. In general, carbs are the main source of fuel, especially when performing a high-intensity exercise. During low-intensity and with long periods of steady-state exercise, fat is the more dominant fuel source. Protein isn’t a major fuel source during exercise, but an essential nutrient for anyone undertaking any kind of exercise routine. This is because when you exercise, you are effectively tearing and breaking muscle fibres apart, which then need to be repaired by the body, requiring protein to do so.
No matter what type of workout you do, supplying your body with the proper nutrients is essential and you need a healthy balance of all three for optimum health.