You know I play soccer, which means I do a great deal of running. It takes a lot of energy, and I want to do everything I can to boost my energy, so I probably need to include more proteins in my diet, right? Proteins are a good source of energy for me, right? How would you respond to Mikala's statement that soccer is a type of sport where proteins would be used as a fuel source? If you need to review Mikala's registration form here it is. A. Yes, proteins are a source of energy for you during exercise, along with fats and carbohydrates. B. No, fats and carbohydrates are the primary fuel sources for your exercise. Proteins are not a significant source.