Which macronutrient provides the most energy per gram?

Fats provide the most energy per gram compared to other macronutrients. Specifically, fats yield about 9 calories per gram, which is significantly higher than the 4 calories per gram provided by carbohydrates and proteins. This higher caloric density makes fats an efficient source of energy for the body.

Additionally, while alcohol does provide energy at approximately 7 calories per gram, it is not considered one of the primary macronutrients in dietary terms. Instead, it is classified differently due to its effects on metabolism and health.

In summary, the energy content of dietary fats makes them the most concentrated source of calories, which is why they are recognized as providing the highest energy per gram among the macronutrients listed.