As Dr. Charles Nechemias (a diabetes specialist at Mount Sinai) notes in his introduction, this is a ""what is"" rather than a ""how to"" book, intended for non-diebetics as well as for patients and their families. The Silversteins do include chapters on testing for and living with diabetes, but they also treat the disease--its causes, effects, and possible treatments--as a subject of inquiry. Their history of diabetes research shows how the insulin breakthrough caused other significant findings to be overlooked and how current practice is leaning back to the pre-insulin emphasis on diet (though the diets are different and insulin still important). The history also supplies some incidental human interest in a story of unfair assignment of credit in the 1923 Nobel Prize. And, like other Silverstein reports, their final chapter on frontiers of diabetes research leaves readers with a sense of the excitement of scientific research and an awareness that there are many leads to follow.