In a rough way, the various occupations for both men and women are classified under three different heads: Light Work, Moderate Work, and Heavy Work. It is necessary that these be understood in examining this table.
TABLE III
CALORIES PER POUND FOR 24 HOURS FOR ADULTS
| Occupation | Calories |
| Sleeping | 12 |
| Sitting | 14 |
| Standing | 17 |
| Walking | 20 |
| Light work | 22 |
| Moderate work | 24 |
| Heavy work | 27 |
Those considered as doing light work are persons who sit or stand at their employment without any great degree of activity. They include stenographers, dressmakers, milliners, teachers, clerks, shoemakers, tailors, machine operators, elevator operators, and conductors.
Moderate work involves a little more activity than light work, but not so much as heavy work. Professional cooks, professional housekeepers, housekeepers in their own homes, professional chambermaids, waitresses, masons, drivers, chauffeurs, plumbers, electricians, and machinists come under this class.
Persons doing heavy work are the most active of all. They include farmers, laundresses, excavators, lumbermen, miners, metal workers, and soldiers on forced march.
39. To show the variation in the amount of food required according to body weight, Table IV is given. The scale here presented has been worked out for two persons who are normal and whose weight is correct, but different, one weighing 130 pounds and the other 180 pounds. It is assumed, however, that they are occupied in 24 hours with activities that are identical, each one sleeping 8 hours, working at moderate labor for 8 hours, walking 2 hours, standing 2 hours, and sitting 4 hours.
TABLE IV
DIFFERENCE IN FOOD REQUIREMENTS THROUGH VARIATION IN WEIGHT
| Number of Calories for 130 Pounds | ||
| 8 | hours, sleeping | 520 |
| 4 | hours, sitting | 303 |
| 2 | hours, standing | 184 |
| 2 | hours, walking | 216 |
| 8 | hours, moderate work | 1,040 |
| -- | ----- | |
| 24 | 2,263 | |
| Number of Calories for 180 Pounds | ||
| 8 | hours, sleeping | 720 |
| 4 | hours, sitting | 430 |
| 2 | hours, walking | 300 |
| 2 | hours, standing | 238 |
| 8 | hours, moderate work | 1,440 |
| -- | ----- | |
| 24 | 3,128 | |
To find the total number of calories required for these activities, the weight, in pounds, is multiplied by the calories per pound for 24 hours for a certain activity. Thus, as in Table IV, if a person weighing 130 pounds sleeps for 24 hours, the number of pounds of weight, or 130, would be multiplied by 12, which is the number of calories required per pound in 24 hours for sleeping. However, since only 8 hours is occupied by sleep and 8 is 1/3 of 24, the required number of calories would be only 1/3 of this number. In this way each item is worked out in the table, as is clearly shown by the following figures: