How many calories per $g$ does protein provide?

• A. $7$ calories per $g$
• B. $9$ calories per $g$
• C. $4$ calories per $g$
• D. $2$ calories per $g$

Answer: (C)

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, 9 calories per gram, 4 calories per gram, and 2 calories per gram.
4. Recognize that the correct value for the calories provided by protein per gram is 4 calories, based on standard nutritional information.
5. Conclude that the correct answer to the problem is that protein provides 4 calories per gram.