Nobody can say flatly how many calories a human needs to survive. Too many factors depend upon the individual, his environment, his activity and his general condition. In a northern industrial country, a 30-year-old, 150-lb. man needs a bare 3,000 calories a day; a 125-lb. woman and a six-year-old boy each require about 2,000. In the tropics, where people do not need many calories just to maintain body heat, the figures fall. But there is no disagreement on what happens to the child or adult whose caloric intake drops below his daily expenditure of...
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