Ever wonder how food like pizza or spaghetti moves through our body? It all happens in our digestive system, otherwise known as our guts. Working twenty-four hours a day, it makes sure the food we eat turns into energy, nutrients, and waste.

In this revised edition, featuring clear text and stunning full-color photographs, Seymour Simon takes us step-by-step through the digestive system.

Readers will learn all about digestion, from the moment you chew your food to when it moves throughout your major organs, such as the stomach and intestines, and how waste is eventually eliminated. Most importantly, he explains how something that happens inside everyone, every day, is such an essential part of our human body.

Perfect for young scientists’ school reports, this book includes an author's note, a glossary, and an index and supports the Common Core State Standards.