Not a traditional diet book, but one that explains the whys and hows our bodies do what they do when it comes to food, how they process nutrients, and the effects modern, processed foods have on us. I already knew part of this, but had forgotten it, and that was a really good refresher about it all. The rest also makes so much sense.
(Also, I definitely appreciate that while the author is a bariartric surgeon, he's not pushing his practice on overweight readers, on the contrary: it's all about giving us tools to understand and make better food choices in general. Not about ready-made diet recipes and diet "tips and tricks".)