Relative macronutrient calorie density compared to ketone bodies

NutrientEnergy in kcal/gEnergy in kJ/g
Fat938
Alcohol729
Protein417
Carbohydrate3.7516
Dietary fibre28
Ketone bodies4–4.517–19

One kilocalorie (1 kcal) is equivalent to 4.18 kilojoules (4.18 kJ)