Will eating this right now bring me hanger or happiness? Hmm... sounds like a good idea to ask this question any time I am going to eat. It reminds me of having a treat that tastes good, but that happiness is gone once too many have been consumed.
This book sounds like it will help put eating in a different light. If it is only going to bring you to the point of being hangry, why eat it? Only eat if it will make you happy. Learn what type of person you are and why you eat what you eat when you eat it.