Review Question - QID 100419

A 15-year-old African-American male with a BMI of 22 is brought to his physician by his mother to address concerns about a change in his dietary habits. The patient's mother notes that he is constantly hungry and thirsty, despite his eating and drinking water in excess. She also reports an increase in his use of the bathroom. The physician begins explaining that her son's symptoms are likely due to which of the following?