Question: Bob is a 63-year-old man with a 10-year history of type 2 diabetes who had previously achieved glycemic control on metformin 1,000 mg twice daily, glipizide XL 10 mg once daily, and liraglutide 1.8 mg subcutaneously daily. Although his diet was not perfect, Bob was losing 1 lb every 2 weeks. He now comes in complaining of excessive involuntary weight loss, fatigue, and nocturia three times per night.