From these data, it is possible to compute the dietaries of people of different occupations. For example, the energy requirement for a bookkeeper (male) leading an inactive muscular life is:
8 hours sleep (65 Calories per hour) 520 Calories 9 hours work at desk (100 Calories per hour) 900 Calories 4 hours sitting at rest and reading (100 Calories per hour) 400 Calories 3 hours walking (170 Calories per hour) 510 Calories ——————- 2330 Calories
The energy requirement for a man of severe muscular activity, such as excavating, is:
8 hours sleep (65 Calories per hour) 520 Calories 8 hours excavating (450 Calories per hour) 3600 Calories 1 hour walking (170 Calories per hour) 170 Calories 7 hours sitting at rest (100 Calories per hour) 700 Calories ——————- 4990 Calories
Another authority [Footnote 97: "Textbook of Physiology," p. 141,
Tigerstedt.] gives these data pertaining to men engaged in muscular work:
Shoemaker requires 2001-2400 Calories per day
Weaver requires 2401-2700 Calories per day
Carpenter or mason requires 2701-3200 Calories per day
Farm laborer requires 3201-4100 Calories per day
Excavator requires 4101-5000 Calories per day
Lumberman requires 5000 or more Calories per day
The following data regarding the energy requirements of the average woman in some of her common occupations have been formulated [Footnote 98: See "Feeding the Family," p. 76, by Mary Swartz Rose, Ph.D.]:
At rest 1600-1800 Calories per day
Sedentary occupations 2000-2200 Calories per day
Milliners Teachers
Bookkeepers Seamstresses
Stenographers Machine operatives
Occupations involving standing, walking,
or manual labor 2200-2500 Calories per day
Cooks in family groups Chamber maids
General housekeepers Waitresses
Occupations developing muscular
strength 2500-3000 Calories per day
Laundresses Cooks for large groups
(3) Relation of Age to Daily Energy Requirement.—Young children, i.e. those under eight or nine years of age, do not require as much food as adults. The food requirement of a child and of an adult is not proportional to weight, however. In proportion to his weight a child requires more food than an adult. The growing child needs food, not only to give energy to the body and rebuild tissue, but to build new tissue. An aged person needs less food to build new tissue. Furthermore, since an old person's strength is somewhat lessened, he needs less food to carry on the activities of the body. Hence, the aged person requires less food than the adult of middle life. The following table [Footnote 99: From "Chemistry of Food and Nutrition," Second Edition, by Henry C. Sherman, Ph.D., p. 197.] gives the differences in energy requirement of children from one to seventeen years inclusive. It is thought that after the age of seventeen, food requirement will depend quite as much upon occupation as upon age. Hence, the foregoing tables can be used to estimate energy requirement for all ages above seventeen:
Children of 1-2 years inclusive 1000-1200 Calories per day
Children of 2-5 years inclusive 1200-1500 Calories per day
Children of 6-9 years inclusive 1400-2000 Calories per day
Girls of 10-13 years inclusive 1800-2400 Calories per day
Boys of 10-13 years inclusive 2300-3000 Calories per day
Girls of 14-17 years inclusive 2200-2600 Calories per day
Boys of 14-17 years inclusive 2800-4000 Calories per day