Calories, abbreviated as card and cal, are transliterated from English. Calories are widely used in nutrition measurement and fitness manuals, and the international standard unit of energy is Joule.
Most people associate calories with what we eat or drink, such as "This soda contains 200 calories". In fact, the calories listed on food packaging are calories, and the capital letter C is also marked, which is equivalent to the heat required to raise 1 000 grams of water from 14.5 degrees Celsius to 15.5 degrees Celsius at1atmospheric pressure, which is about equal to the internal energy of 4 186 joules.
If we eat and consume exactly the same calories, only considering the weight, there is no difference between a protein calorie and a fat calorie, they are just units of energy. If the consumption is equal to the energy intake, the weight will not change; If you consume more than you consume, you will lose weight.
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. Generally speaking, adults need at least1500 ~ 2,000 calories a day to maintain body function, because even if you lie still, your body still needs energy to maintain body temperature, cardiopulmonary function and brain operation.
Our body "burns" calories in food through metabolism, which breaks down carbohydrates into glucose and other sugars through enzymes, fats into glycerol and fatty acids, and protein into amino acids.
Then, these molecules are transported to cells through the blood stream, where they can be absorbed and utilized immediately, or they can enter the final metabolic stage to react with oxygen and release their stored energy.