The Beck Diet Solution (book, workbook, or audio book) by Judy Beck, PhD) has completely changed the way I interact with food. If you've ever had trouble with overeating or consistency, this can probably help.
The book, audio book, and workbook all contain the same information. I'd recommend the audio book though. The CDs contain the workbook pages as PDFs so you can print them yourself, and listening on your iPod during a walk is perfect for reflection.