This book has a very interesting idea - can you really learn to be more mindful about food and eating by eating from one bowl, and one bowl alone? The buddha ate from one bowl, and many monks to this day collect their daily food in a bowl, so can it help you?
Apart from the obvious fact that it will limit what you can eat together (pizza and soup aren't exactly going to go great in one bowl!), there is also the bonus that you can see everything you are going to eat in one bowl together, so you can gauge how much you are eating. Also, having a special bowl for eating should help you get in the right mindset when it comes to meal times.
Although I won't be only eating out of one bowl from now on, I am going to take on many of the mindfullness suggestions from this book. I think one of the most useful skills this book discusses is giving yourself the ability to eat whatever you actually feel like eating, in the amount that your body actually wants. It is also very useful to think about how eating a certain food has made you feel.
Overall, an interesting book, and you don't necessarily have to start eating only from one bowl to get some of the benefits.