the internal work of his body. This totals 1440 calories. To take care of his eight hours active labor, he needs 180 calories an hour more, or a total of 1440 calories. For each of three hours of light activity he needs 110 more calories an hour, or 330 calories, and for five hours sitting at rest, 40 calories more an hour or 200 calories additional. This gives his total daily caloric requirement of 3410.
A man of the same weight, doing light work, will need 1440 calories a day for his internal activities, 200 calories more for five hours sitting at rest, and 1210 more calories for eleven hours light work, making his total daily energy requirement 2850 calories.
Boys and girls in their teens need as much food as grown people and in some cases more. This is because they have not completed their growth and are unusually active. Children from two to twelve years of age must have surprisingly large amounts of food as compared to grown persons. The child from two to five needs about half as much food as the grown person of moderate activity, while children from ten to thirteen years of age may need fully as much food as they will later on in their teens.
The comparative energy requirement per day of children of various ages and of average size and activity is shown in the following table:
| 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 | 1500–2000 calories per day |
| Children of 10–12 years, inclusive | 1800–2800 calories per day |
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