This book is really good and very easy to read! It is filled with information backed by research on 5-HTP and how the body uses it. I have been following the suggested steps for obesity and depression and I started noticing a difference almost immediately and have experienced no side effects. For those of you battling depression, insomnia or obesity, or if you just want to start feeling better, I highly recommend this book, and recommend following the suggestions outlined in his book. You won't be sorry!