WITH HIS 2016 DEBUT, The Obesity Code, Toronto doctor Jason Fung became a sought-after expert on the benefits of intermittent fasting. He also became one of the robust diet-book category’s bestselling authors. His first book has been on Bookmanager’s Diet chart for 241 weeks; its 2018 follow-up, The Diabetes Code, for 125 weeks; and this year’s Life in the Fasting Lane, an introduction to intermittent fasting co-written by Eve Mayer and Megan Ramos, for 25 weeks.