He did write The Complete Guide to Fasting, which is excellent and covers all the science behind it. There is also Delay, Don't Deny: Living an Intermittent Fasting Lifestyle by Gin Stephens which is basically One Meal a Day, however she includes links to all the reports to everything she talks about in the book and yes, she actually read them and encourages others to do the same, not just believe what she says. There's always the fasting subreddit's wiki that has links to other info: https://www.reddit.com/r/fasting/wiki/fasting_in_a_nutshell