We explain what a calorie is and how this energy value is measured. Also, what are they for and a list of meals with their calories.
When we hear about calories, we must understand by the term a more or less informal unit of energy contained in food , and that is understood by comparing them with the specific thermal capacity of water . Since the use of calories as a term is not compatible with any formal system of units, it often expresses an ambiguous, undetermined amount of energy.
Calories were defined by Nicolás Clément in 1824 , initially as calorie-kilogram (kilocalorie), which was how it was introduced in the French and English books between 1842 and 1867. It was stipulated as “the amount of heat needed to produce an increase in temperature of 1 ° C in a 1 g water sample (calorie-gram). However, the use of Joules (J) and multiples and submultiples thereof, as the unit for measuring the amount of energy , is now considered preferable .
Calories became very popular during the second half of the twentieth century as part of the diets that proposed calorie counting as a way to ensure that the food consumed did not provide the body with an excess of nutrients that it should store as fat.
Calories (lime) represent the energy value of food, expressed in the amount of heat needed to increase a mass of water of 1 gr. This means that one thousand calories constitute one kilocalorie (kcal) , equivalent to about 4,185 kilojoules (kJ). As far as food is concerned, these values are usually expressed in the amount of kilocalories per 100 grams of food (kcal / 100gr). Despite being in numerous food packages, calories are not recognized within the International System (SI) of weights and measures.
Since calories are not a thing, but a unit of measurement, we can say that they are used to determine the amount of energy contained in things , which is particularly useful, as we have already said, to establish some kind of comparisons between different food and their respective impacts on the metabolism of our body.
A more caloric food will incorporate a greater amount of chemical energy , which by exceeding what our body requires for its daily average functioning (at least 2,500 calories a day and at rest), it becomes reserves, that is, fat. It is said that about 7,000 calories equals one kilogram of body fat.
It depends on the food:
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