Energy in physics

What does that even mean? Energy is energy and it doesn't make a difference in what subject it comes. Your body requires energy to function efficiently and this energy is provided in the form of food. When the body breaks down the different foods that you consume this gets transferred into energy. Energy for the body can be obtained from foods such as carbs, proteins, and fats. Fats are one of the main sources of sustained energy in the body. Burning fat is like burning coal for a steam train. I hope that makes sense to you, because I cant think of anything else.