* Carbohydrates: These are the body's preferred source of energy. They are broken down into glucose, which is then used in cellular respiration to produce ATP (adenosine triphosphate), the main energy currency of cells.
* Lipids (fats): While not the body's first choice, fats can be broken down and used for energy. They provide more energy per gram than carbohydrates, but they are less readily available and their breakdown takes longer.
Let me know if you have any other questions!
