What are calories
Nutritionists measure the amount of heat produced by metabolising food in units called KILOCALORIES(kcal).
A kilocalorie is the amount of energy it takes to raise the temperature of 1 kilogram of water at sea level by 1 degree.
It can also be express as KILOJOULES - which is more scientifically accurate but Kcals has been adapted as the norm.
1 Kcal is equivalent to 4.18 Kj.