The total kJ content of a food item depends on the proportion of macronutrients (carbohydrate, fat, protein, and alcohol) present in the food and the serving or portion size. Alcohol is not needed by the body and can contribute large amounts of energy to a person’s daily intake.
When we compare the amount of kJs between foods of the same weight, volume or serving size we are looking at the energy-density of foods. The energy density of a food item is dependent on its macronutrient composition.
Energy density is calculated by dividing the kJ content of a food by the weight (grams).
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When comparing the same weight, volume, or serving size, foods high in fat have a higher energy-density than foods high in protein or carbohydrate.
Examples of lower-energy density foods include fruits and vegetables
and higher energy-density foods include takeaway foods, fatty meats, alcohol, and oils and spreads.
Lower energy-density food
Higher energy-density food