Calories and kcal are used interchangeably and refer to the same amount of energy, but kilojoules require conversion. Usage may differ depending on where you live. Calories are a measure of energy.

But is it really as simple as that? Sports therapist Katie Hiscock talks figures... What's in a calorie (kcal)? A kcal is a unit of energy contained in food and drink. UK guidelines currently advise ...