Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Think and Explain: 97

Answer

Total energy is conserved. A person who expends less energy than s/he takes in will store energy in the body's chemical energy reserves, i.e., fat. One who expends more energy than is consumed will tap into fat reserves. An undernourished person cannot perform extra work for very long before requiring extra food.
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