I read this book called the gerson therapy where it talks all about health and how many people have cured their cancer and tons of other illnesses following the program...it's all about eating lots of fruits and vegetables and drinking alot of juice...it could save your dads life... this is their website
http://gerson.org/gerpress/ i strongly recommend looking into it the book is amazing...i am currently following a similar version of it for a different reason but i am starting to regain my health once again...