Which statement about energy density is correct?

Which statement about energy density is correct?

• A. Carbohydrates provide more energy per gram than fats and proteins
• B. Fat provides more energy per gram than carbohydrates and proteins
• C. Proteins provide more energy per gram than fats
• D. Water provides energy

Answer: (B)

Energy density means how many calories are in each gram of food. Fat provides about 9 kcal per gram, while carbohydrates and proteins each provide about 4 kcal per gram. Water has no energy. So fat is more energy-dense than both carbohydrates and proteins, which is why foods high in fat deliver more calories per gram. The other statements don’t fit because they claim carbs or proteins exceed fat in energy per gram, or because water adds energy, which it does not.

Energy density means how many calories are in each gram of food. Fat provides about 9 kcal per gram, while carbohydrates and proteins each provide about 4 kcal per gram. Water has no energy. So fat is more energy-dense than both carbohydrates and proteins, which is why foods high in fat deliver more calories per gram. The other statements don’t fit because they claim carbs or proteins exceed fat in energy per gram, or because water adds energy, which it does not.