Here's a breakdown of their roles:

* Carbohydrates: These are the body's preferred energy source. They are quickly broken down into glucose, which is used by cells for immediate energy needs. Examples include sugars, starches, and fiber.

* Fats (Lipids): These provide a more concentrated source of energy than carbohydrates. They are stored in the body and can be broken down for energy when carbohydrates are not readily available. Examples include butter, oil, and cholesterol.

* Proteins: While proteins are primarily used for building and repairing tissues, they can also be broken down for energy in situations of extreme calorie deprivation or prolonged fasting.

Important Note: While all three are important, carbohydrates are generally considered the most efficient and readily available source of energy for the body.