What does Napoleon Hill say about food in his interview with the devil. It’s really important. As a Certified Fitness Trainer and Certified Life Coach since 2002, I've read many books about personal development, and one that stands out is Napoleon Hill's "Outwitting the Devil".In this book, Hill discusses various aspects of life, including the role of food in our lives. Here's what Napoleon Hill has to say about food and how it relates to our success.