First, the definition of heat
Calories, abbreviated as card and cal, are transliterated from English. It is defined as the heat required to raise 1 gram of water to 1 degree Celsius at 1 atmospheric pressure; Calorie is a kind of calorie unit, which is widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule.
Second, the physiological function
Just as computers consume electricity and trucks consume oil, so do human daily activities. Heat not only provides energy for people's exercise, daily work and life, but also provides energy for human life activities, blood circulation, breathing, digestion and absorption.
People who lose weight can burn fat through exercise, which can accelerate calorie consumption and achieve the goal of healthy weight loss.
Third, the source of food.
Where does the heat come from? Carbohydrates, fats, protein.
There are three kinds of calories in the fuel and food necessary for human body.
First of all, the basic fuel of the body
Calorie is the transliteration of French Calorie, which is the unit for calculating calories, and it is divided into big card and small card. 1 calorie is equivalent to the heat used to raise 1 liter of water to 1 degree Celsius at 1 standard atmospheric pressure; 1 calorie equals 1000 calories.
All the calories our body needs come from food. When eating, the chemical action of human metabolism decomposes food and converts it into energy. Daily activities, from breathing to running a marathon, are driven by burning calories.
Combustion heat is one of the metabolic processes. If the body needs enough oxygen, water and food, cells will work actively to burn calories at the best speed. Therefore, a healthy diet, good digestion, proper minerals and vitamins and regular exercise are indispensable.
Second, there are three kinds of calories in food.
There are three kinds of calories in food: protein's calories are the basic nutrients to strengthen muscles, mainly from meat, dairy products and eggs, and each gram contains 4 calories.
Carbohydrate calories are the main energy source of human body under normal circumstances, which are contained in rice, flour, noodles, bread, cereals, vegetables and fruits, and each gram of calories is also 4 calories; Fat contains 9 calories per gram, which is found in both oil and cream.