In human nutrition, one gram of alcohol (ethanol) provides approximately how many kilocalories (kcal)?

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

Answer: (B)

Verified step by step guidance

1. Understand that the problem is asking for the energy content provided by one gram of alcohol (ethanol) in terms of kilocalories (kcal).
2. Recall that macronutrients provide different amounts of energy per gram: carbohydrates and proteins provide about 4 kcal/g, fats provide about 9 kcal/g, and alcohol provides a distinct value.
3. Recognize that alcohol (ethanol) is a unique macronutrient that provides energy but is not classified as a carbohydrate, protein, or fat.
4. Use the known standard energy value for alcohol, which is approximately 7 kcal per gram, based on nutritional science data.
5. Conclude that one gram of alcohol provides about 7 kilocalories of energy, which is between the energy provided by carbohydrates/proteins and fats.