Type 1 diabetes mellitus __________?
1) is the most common form of the disease; more than 90 percent of all diabetics have type 1 diabetes
2) is treated by improving insulin receptor efficiency rather than by giving insulin
3) can be controlled for many years with exercise and a proper diet
4) is an autoimmune disease in which the immune system attacks beta cells in the pancreas
5) is a common disorder in overweight individuals older than 40