This is a practical resource for readers who wish to learn about developing and maintaining healthy lifestyle habits. Teens explore the everyday steps they can take to improve their immune systems, including eating well, exercising, losing weight, reducing stress, and getting the proper amount of sleep. Each volume explains some of the diseases and conditions that can be created or exacerbated when healthy choices are not made, including heart disease, high blood pressure, high cholesterol, diabetes, infections, vitamin deficiencies, and certain cancers. Each book has fact panels, such as “Ten Great Questions to Ask a Health Professional” that simplify concepts and offer additional learning opportunities.