This document discusses personalized medicine approaches for diabetes. It mentions that mutations in the MC4R gene can diminish the success of bariatric surgery for obesity. It also notes that around 5% of diabetes cases have a monogenic cause related to beta cell dysfunction, such as mutations in the KCNJ11/ABCC8 genes encoding the KATP channel, where patients can often be switched from insulin to sulfonylurea drugs. Finally, it states that most cases of type 2 diabetes have a polygenic cause involving interactions between many genes and the environment.