I could be nasty and summarise this book in one sentence: fast for 16 hours a day and make sure to drink Dave Asprey’s Bulletproof Coffee. Because it gets a little bit annoying (more than annoying) that he promotes his own products on almost every page of the book.

But to be fair, I chose to buy and read this book from beginning to end for a good reason. I am interested in intermittent fasting. Asprey seems rather more than interested — he’s obsessed. A lot of what he writes is his own experiences with fasting. So some of it is interesting and he writes well. I’ve read other books he wrote which I enjoyed more. And I did try Bulletproof Coffee. Once. My partner still makes fun of me for that.