Little boy's 'Chocolate Bar' book raises $1 million for rare liver disorder

Dylan wrote the book to help his friend, Jonah, who suffers from the incurable disease.

Dylan Siegel has done something pretty amazing for someone so young.

Back in 2012, inspired by his best friend Jonah Pournazarian, he decided to write a book to help raise funds for research into a rare liver disease that makes sufferers unable to regulate their blood sugar levels. Glycogen storage disease type 1B is incurable and Jonah, 9, is one of only 500 children in the old with the disease.