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.... & P. railroad, on a run between Nahant and Green Island, Iowa. It was the morning of April 5... could run without power, or a car without gas. Evre- reery breath quires an expenditure of energy...- Activity Demands Energy Foods Every type of daily activity, including work and exercise, requires... additional fuel. If you walk slowly, you expend twice as much energy as when you sit still. And when you walk... fast, you may use up four, five or six times as much energy. The chief fuel, or energy producing foods