What is the function of calories?

1 ANSWERS

1. Guest3033
   

   The calorie is a pre-SI unit of energy, in particular, heat.In most fields, its use is archaic, and the SI unit of energy, the joule, has become accepted. However, it remains in common use as a unit of food energy. It was first defined by Professor Nicolas Clément in 1824 as a kilogram-calorie, and this definition entered French and English dictionaries between 1841 and 1867. Etymology: French calorie, from Latin calor (heat).
   
   The second definition is the one commonly used to express food energy, e.g. when discussing dieting or nutrition plans. Under this definition, 1 g of pure carbohydrate yields about 4 Calories of energy, and the recommended intake for an adult person is about 2,000 - 2,500 Calories/day. It is alternatively referred to as Calorie (Cal), kilocalorie (kcal) or even calorie with lowercase 'c'. The potential for confusion can be avoided by using the SI units (joules or kilojoules).
   
   One food Calorie (1 kcal or 1,000 calories) is the amount of digestively available food energy (heat) that will raise the temperature of one kilogram of water one degree Celsius.

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