How many calories per $g$ does protein provide?

• A. $7$ calories per $g$
• B. $11$ calories per $g$
• C. $9$ calories per $g$
• D. $4$ calories per $g$

Answer: (D)

Verified step by step guidance

1. Understand that proteins, carbohydrates, and fats are macronutrients that provide energy in the form of calories.
2. Recall that each macronutrient provides a specific amount of calories per gram: carbohydrates and proteins provide 4 calories per gram, while fats provide 9 calories per gram.
3. Identify the options given in the problem: 7 calories per gram, 11 calories per gram, 9 calories per gram, and the correct answer, 4 calories per gram.
4. Recognize that the problem is asking for the caloric value of protein, which is a fundamental concept in nutrition and biochemistry.
5. Conclude that the correct caloric value for protein is 4 calories per gram, based on standard nutritional information.