There are three main classes of nutrients that supply your body with energy:
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Carbohydrates: These are the body's primary source of energy. They are broken down into glucose, which is used by the body for fuel.
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Fats: Fats are a concentrated source of energy and are important for long-term energy storage. They provide more than double the energy per gram compared to carbohydrates and proteins.
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Proteins: While proteins are primarily used for building and repairing tissues, they can also be used as an energy source, especially when carbohydrate intake is low.
In summary, carbohydrates, fats, and proteins are the three classes of nutrients that can supply energy to the body.