Kilojoules in food
The foods we eat provide energy, which is measured in kilojoules. Just how much energy depends on the amount of carbohydrate, protein and fat the food contains. Foods such as fruits, vegetables and legumes are low-energy (kilojoule) dense foods. Fats and alcohol are by far the most energy-dense foods. This is why they should only be consumed in moderation, particularly if you are overweight or obese.
The energy value per gram of various food components includes: Fat – 37 kJ (9 Cal) – not all fatty acids may provide the same amount of energy
Alcohol – 29 kJ (7 Cal)
Carbohydrates – 16 kJ (4 Cal) – not all carbohydrates may provide the same amount of energy
Protein – 17 kJ (4 Cal)
Dietary fibre – 13 kJ (3 Cal) – if fermented by bacteria in the large intestine
Water – 0 kJ (0 Cal).