Answer:
Because it comes from the meaning of the word calories. It is the equivalent of energy obtained from food, which is used to carry out the functions related to metabolism, physical activity and repair of the body and its tissues in general.
Explanation:
Calories, whose name etymologically is derived from the Latin "heat", in living beings are the equivalent of energy obtained from food, which is used to perform the functions related to metabolism, physical activity and repair of body and its tissues in general. Even when thinking, man consumes calories, since energy is needed for it.
From the point of view of science, calories are a unit of energy, the one needed to raise the temperature of a gram of water from 14.5 to 15.5 degrees Celsius while at sea level. The calorie is part of the Technical System of units, and is usually measured in kilocalories or Kcal. In most sciences today, joule (from the International System of Units) is used as an energy measure, and calories basically continue to be used in the field of nutrition.
