A calorie can be defined as a unit of energy supplied by food. Whether you're eating
carbohydrates, fats, sugars, or proteins, Calories are everywhere. The total number
of calories you consume and burn in 24 hours is what determines your weight. So keep
an eye on those calories you’re packing in everyday, because they count!
Within a healthy, balanced diet, a man needs around 10,500kJ (2,500kcal) a day to
maintain his weight. For a woman, that figure is around 8,400kJ (2,000kcal) a day.
These values can vary depending on age, metabolism and levels of physical activity,
among other things.