Diabetes mellitus is a group of diseases that affect a person’s ability to process blood glucose (sugar). Normally, a person’s pancreas produces insulin to help their body store and use the sugar from the food they eat, but when a person has diabetes, their pancreas releases little or no insulin, or their body does not react to the insulin being produced.
https://www.kindredhospitals.com/our-services/ltac/conditions/diabetes