How many calories does an adult need to consume a day?

According to the book Calories and protein Intake published by the World Health Organization, a healthy adult woman needs to consume 1800 ~ 1900 calories every day, while men need 1980 ~ 2340 calories.

In 2000, China Nutrition Society put forward the reference intake of dietary energy for China residents, pointing out that adult male light and moderate manual workers need 2400-2700 calories a day; The daily energy requirement of female light and moderate manual workers is 2 100-2300 kcal. Babies, children and adolescents, pregnant women and nursing mothers, and the elderly have different physiological characteristics and different energy needs.

If you want to get your daily calorie intake more accurately, you can refer to the announcement of basal metabolic rate (intake is greater than this figure):

Female: BMR = 655+(9.6 x weight kg)+( 1.8 x height cm)-(4.7 x age).

Male: BMR = 66+( 13.7 x weight kg)+(5 x height cm)-(6.8 x age).

Extended data:

Heat means that when the change of system state comes from the destruction of thermal balance conditions, that is, from the temperature difference between the system and the outside world, we say that there is thermal interaction between the system and the outside world. As a result, energy is transferred from a high-temperature object to a low-temperature object, and the transferred energy is called heat. Heat and work are two different forms of energy transfer with the change of system state, and they are the measures of different forms of energy transfer. They are all related to the intermediate process of state change, so they are not functions of system state.

In the process of human life activities, all life activities need energy, such as the synthetic reaction of material metabolism, muscle contraction, gland secretion and so on. And these energies mainly come from food. Nutrients contained in animal and plant foods can be divided into five categories: carbohydrates, lipids, protein, minerals and vitamins, and water is six categories. Among them, carbohydrate, fat (fat can also store calories) and protein can release energy through oxidation in the body. These three are collectively referred to as "productivity nutrients" or "heat sources".

Discovering history: human beings have been constantly researching and exploring for their own changes. Until the end of 19. Scientists all over the world have found that metabolic rate is directly proportional to the surface area of human body, and food has a special dynamic function, which proves that the law of conservation of energy is also applicable to human body, and has compiled a food calorific value table and energy conversion coefficient.

Biochemical reaction: The average metabolic capacity of carbohydrate, fat and protein per gram is 4 kilocalories, 9 kilocalories and 4 kilocalories respectively. At the same time, generally speaking, a person's calorie intake is equal to his consumption within 5-7 days.

General function: maintain normal body temperature and radiate heat energy to the outside world.

Normal needs: The dietary energy reference intake of China residents put forward by China Nutrition Society in 2000 pointed out that the daily energy requirement of adult male light and moderate manual workers is 2400-2700 calories; The daily energy requirement of female light and moderate manual workers is 2 100-2300 kcal. Babies, children and adolescents, pregnant women, nursing mothers and the elderly have different physiological characteristics and different energy requirements.

Shortcomings:

When the daily energy intake of human body is insufficient, the body will use its own energy reserves and even consume its own tissues to meet the energy demand of life activities. People have been hungry for a long time. In a certain period of time, the body will experience basal metabolism reduction, physical activity reduction and weight loss to reduce energy consumption and make the body adapt to energy intake. At this time, energy metabolism will reach a new low-level balance from negative balance. As a result, children's growth and development are stagnant, adults are emaciated and their working ability is reduced.

Overexpression: Too much energy will be stored in the body. The storage form of energy in human body is fat, and the abnormal accumulation of fat in human body will lead to obesity, bring unnecessary burden to the body, and may become a risk factor for cardiovascular diseases, some cancers, diabetes and other epidemics.

Food sources: The energy sources of human body are carbohydrates, lipids and protein in food. These three nutrients are ubiquitous in all kinds of foods. Cereals and potatoes are the most economical food sources because they are rich in carbohydrates. Oil crops are rich in fat; Animal food generally contains more fat and protein than plant food; Except soybeans and hard fruits, they are rich in oil and protein; Vegetables and fruits are generally less in content.

People in need: people who consume a lot of physical strength and need to lose weight should increase or decrease their heat intake according to the reference intake.

Supplement cycle: Everyone should supplement the daily dietary energy intake that is balanced with their basic metabolism, physiological state and physical labor.

Remarks: part of the daily energy intake of infants, children and adolescents, pregnant women and nursing mothers and convalescent patients is used for tissue growth and special physiological changes.

Reference link:

Hot (word)-Baidu encyclopedia

Basal metabolic rate-Baidu Encyclopedia