Avoid this book altogether! Extreme weight loss efforts such as this are the exact thing that coaches and organizations should NOT promote. These methods are dangerous at all ages and should not be integrated into the youth populations. All people should suggest proper balanced diet and appropriate amounts of exercise for sustainable weight loss. Books like this mold a teen when proper eating and physical activity habits should be established. Bad habits run rampant now a days. We should educate with sound, established, safe practices that can be followed for a lifetime. I am here and work to help mold educated, safe, and great citizens and this is not safe nor proper education in my opinion. Take the money you would use on this and put it toward a consult with a registered dietitian or nutritionist and you may spend a little more but you can't ask questions to a book and get a response either.