I've been hunting around for years trying to find a book by someone who has lost at least 200 pounds and has good advice. Either they haven't lost a lot of weight. Or it's mostly memoir and very little help. Or they've lost the weight through surgery or in an unhealthy manner.
Finally Thin! by Kim Bensen was just what I was looking for. About a third of the book is about how she gained 200 pounds, lived as an obese person and finally lost and maintained the weight. The second third gives sound advice on how to lose weight that allows that we are all unique people and that one size does not fit all. The final third is recipes.
About the only thing I didn't like was her reliance on highly processed low-fat and no-fat foods. I personally believe they aren't very healthy. But in general, this is the best book I've found on the subject.