Mavis Jukes has twenty years of writing experience and twenty years of teaching experience and is a member of the California bar. She has written many books for kids and teens, including three other health-related titles: It's a Girl Thing: How to Stay Healthy, Safe, and in Charge (for girls 12 and up): Growing Up: It's a Girl Thing: Straight Talk About First Bras, First Periods, and Your Changing Body (for girls 8 and up); and The Guy Book: An Owner's Manual: Maintenance, Safety, and Operating Instructions for Teens (for boys 13 and up).

Lilian Cheung is a lecturer, the director of Health Promotion & Communication, and editorial director of The Nutrition Source website (www.thenutritionsource.org) at the Harvard School of Public Health's Department of Nutrition. She co-edited Child Health, Nutrition and Physical Activity (1995) with the late Surgeon General Dr. Julius Richmond, and also co-authored Mindful Eating, Mindful Life with Zen Bugghist master Thich Nhat Hanh, released by HarperCollins in March 2010 (www.savorthebook.com).