The intake of calories is for the normal operation of human body functions. In 2000, the Nutrition Society of China put forward the reference intake of dietary energy for China residents, pointing out that adult male light and moderate manual workers need 2,400-2,700 kcal of energy every 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.
Calorie intake indicates how many calories should be consumed today, while basal metabolic rate can reflect physical condition. During severe hunger and long-term malnutrition, the basal metabolic rate of the body can be reduced by as much as 50%. Diseases and infections increase basal metabolic rate. Hyperthyroidism and epinephrine can increase basal metabolic rate.
The basal metabolic rate will be higher if the muscle mass is large, because muscle will consume more body energy than fat.
Extended data:
Calculation formula of required heat:
Daily calorie requirement of adults = basic calorie required for basic metabolism of human body+calorie required for physical activity+calorie required for digestion of food.
Heat required for digesting food = 10% x (minimum heat required for basic metabolism of human body+heat required for physical activity)
Daily caloric requirement of adults = 1. 1 x (minimum basal caloric requirement for basic metabolism of human body+caloric requirement for physical activity).
Male: 9250- 10090KJ
Female: 7980-8820 kJ
Note: The daily calories provided by food should not be less than 5,000-7,500 kilojoules, which is the least energy to maintain normal life activities.
A simple algorithm for basic calorie metabolism of human body
Female: basic calories = weight (kg) x 9
Man: Basic calories (calories) = weight (kg) x 10.
Accurate algorithm of basic heat
Woman:
Age formula
18- 30 years old 14.6 x body weight (kg) +450
3 1- 60 years old 8.6 x weight (kg) +830
Over 60 years old, 10.4 x body weight (kg) +600
Man:
18- 30 years old 15.2 x body weight (kg) +680
3 1- 60 years old 1 1.5 x body weight (kg) +830
Over 60 years old 13.4 x body weight (kg) +490
Calculation formula of basal metabolic rate:
There are many formulas for calculating basal metabolic rate, corresponding to different methods. Only three methods are mentioned here, and the most commonly used method is the first one. When calculating, it is more reliable to take the average of the results of the following formula:
(1) basal metabolic rate% = (pulse rate+pulse pressure difference)-11(Gale method)
(2) basal metabolic rate% = 0.75 × (pulse rate+pulse pressure difference × 0.74)-72 (Reed method)
(3) basal metabolic rate% = 1.28 × (pulse rate+pulse pressure difference)-1 16(Kosa method)
To measure basal metabolic rate, lie still for half an hour before breakfast in the morning (but keep awake), keep the room temperature at about 20℃, and measure it by indirect calorimetry.
The unit of basal metabolic rate is kj/(m2 h) (kj/m2/hour), that is, the number of kilojoules of heat released per square meter of body surface per hour.
References:
Baidu encyclopedia-basal metabolic rate
References:
Baidu encyclopedia-calorie intake
References:
Baidu encyclopedia-calories