What is the difference between type 1 and type 2 diabetes?

Dr Sarah Jarvis There are two main types of diabetes mellitus, which are called type 1 diabetes and type 2 diabetes. Type 1 usually first presents in children or in young adults. Type 2 is more associated with being overweight and most often first presents in people over the age of 40 years. However, type 2 diabetes is increasingly diagnosed in children and in young adults. [https://patient.info/health/diabetes-mellitus-leaflet](https://patient.info/health/diabetes-mellitus-leaflet)