Unfortunately, this book was far from what I expected. Even though it is filled with historical background on fasting, it feels hollow. Empty, like just reading some Wikipedia pages. The references are not indicated in the text, which makes it very difficult to fact check, something I felt like I needed to do often. From minor things like the (incorrect) definition of narcolepsy, to the one-sided simplified view of Anorexia nervosa, I feel like the author researched a lot, but can't connect it to their own experience. The writing is needlessly complicated, with many bloated words. There's constant switching between wether fasting is healthy or not. I understand the research is inconclusive, but then acknowledge that. I feel bad, disliking a work where obviously so much time has gone in to, but this really needs to be said. I actually found the small introductions to each chapter where the author describes their seven-day fasts the most fun to read. And I guess that shows what I had expected and hoped to read.