The Way of the Iceman: How the Wim Hof Method Creates Radiant Long-term Health—Using the Science and Secrets of Breath Control, Cold-Training and Commitment

by Wim Hof

He emphasized that the basis of his method could be written on the back of a beer-mat: only eat for a period of five hours a day. In the book, he explains that this practice trains your body to mainly use fat as fuel instead of glucose. This idea also ties in with the production of brown fat during cold training.