What is the assigned energy values of the macro-nutrients?

The assigned energy values of macronutrients are as follows: carbohydrates provide approximately 4 calories per gram, proteins also offer about 4 calories per gram, and fats supply around 9 calories per gram. Alcohol, while not a macronutrient, contributes about 7 calories per gram. These values are used to calculate the energy content of food and guide dietary planning.