In alcohol metabolism, one gram of alcohol provides how many calories?

• A. 7 calories
• B. 9 calories
• C. 2 calories
• D. 4 calories

Answer: (A)

Verified step by step guidance

1. Understand that the problem is asking about the energy yield of alcohol when metabolized by the body, expressed in calories per gram.
2. Recall that macronutrients provide different amounts of energy: carbohydrates and proteins provide about 4 calories per gram, fats provide about 9 calories per gram, and alcohol provides a distinct amount.
3. Recognize that alcohol (ethanol) is metabolized differently from macronutrients but still provides energy, which is measured in calories per gram.
4. Use the known standard value for the energy content of alcohol, which is approximately 7 calories per gram.
5. Conclude that the correct answer is the value that corresponds to 7 calories per gram, distinguishing it from the other macronutrient energy values.