It's a good book, filled with researches, but what I think is some of the researches have opposite research to prove something else, for example on the book mention that you shouldn't be hangry as you'll eat a lot of you decide to eat, and this is opposite of intermittent fasting.
I enjoy reading this book, in some chapters, I use a way to read the conclusion at the end of each chapter and back to the content if there is a point brought my attention.