Which macronutrient is the most energy-dense (provides the most kcal per gram)?

• A. Protein
• B. Fat (lipid)
• C. Alcohol
• D. Carbohydrate

Answer: (B)

Verified step by step guidance

1. Understand that energy density refers to the amount of energy (kcal) provided per gram of a macronutrient.
2. Recall the standard energy values for each macronutrient: protein provides 4 kcal/g, carbohydrates provide 4 kcal/g, fat provides 9 kcal/g, and alcohol provides 7 kcal/g.
3. Compare these values to determine which macronutrient provides the highest number of kilocalories per gram.
4. Identify that fat (lipid) has the highest energy density among the options because it provides 9 kcal/g, which is more than protein, carbohydrates, and alcohol.
5. Conclude that fat is the most energy-dense macronutrient based on this comparison.