Presents an illustrated discussion of the digestive system, covering how it works, problems with digestive diseases and conditions, and how to maintain a healthy system by drinking water, eating fiber, and selecting lean sources of protein.
Explains the processes by which a hamburger and other foods are used to make energy, strong bones, and solid muscles as they pass through the digestive system.
Briefly discusses the various ways plants and animals obtain and utilize food, describes the human digestive system and what happens to a roast beef sandwich when it is eaten, and explains the principles of nutrition.