An adult needs about 2 kilocalories a day, and men need about 2% more than women. :

first, the unit of heat.

generally, the calculation unit of heat is calories. One calorie is the heat needed to raise the temperature of one gram of water by 1 degree Celsius after the food we eat is burned, and one kilocalorie is the heat needed to raise the temperature of one liter of water by 1 degree Celsius, which is also called kcal.

the common conversion relationships of energy units are as follows:

kcal = kcal

1kal =1 kcal

1kj =1 joules

1kal /1 kcal = 1 kcal

1kal/1 kcal =4.19 kj

.

Second, the daily energy required by different groups of people:

The daily energy recommended by China Nutrition Society is as follows:

1. Adult (over 18 years old, 63kg male and 53kg female):

Very light labor (office, etc.) 24kcal (male) and 21kcal (female).

light labor (teachers, etc.) 26 kcal (male) 23 kcal (female);

3, kcal (male) and 2,7 kcal (female) for middle school labor (students' daily activities, etc.);

heavy labor (agricultural production, etc.) 3,4 kcal (male) and 3, kcal (female);

extremely heavy labor (handling, mining, etc.) 4, kcal (male).

2. Old age (6-69 years old):

Very light labor of 2, kcal (male) and 1,7 kcal (female);

light labor of 2,2 kcal (male) and 1,9 kcal (female);

2,5 (male), 2,1 kcal (female) middle-aged workers

3. Old people (7-79 years old)

1,8 kcal (male), 1,6 kcal (female)

2, kcal (male), 1,8 kcal.