This thin book is a straightforward and systematic, albeit pithy, look at Christian fasting. It covers pretty much every reference to fasting in the Bible; questions about motivation; and practical concerns—types of fasts, how to start and break a fast, physical health signs, etc. Besides all that, it has a simple diary of a 21-day fast by a friend of the author, and I thought that was inspiring and encouraging.

There are two gaps the book didn't really address: eating disorders that are so common today (this is an older book), and needing to be careful about sodium/electrolytes during and after a fast. Understandably, these psychological and physiological areas are not the author's domain—he shouldn't be offering medical advice to address these issues, but mentioning the need to consult a doctor would have been good.

Otherwise, I think this is a great to-the-point book that checks a Christian's motivation, challenges them to deeper worship, and provides answers to nearly every spiritual fasting question you can think of.