Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 50 - Nutrition, Digestion, and Absorption - 50.1 - Food Provides energy As Well As Materials for Biosynthesis - 50.1 Recap - Learning Outcomes - Page 1074: 1


Proteins and carbohydrates each contain 4 calories per gram, while fat contains 9 calories. Lipids are the main molecule of energy storage in animals because of how easily and compactly they can be stored. Under the conditions of malnourishment, the body will eventually start to break down its own blood proteins to fuel metabolism after it has burned off fat and carb reserves.

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