What causes type 2 diabetes?

The cause of type 2 diabetes is unknown. Type 2 diabetes (formerly called "adult onset diabetes") occurs when the pancreas produces some insulin (but not enough) or when the cells of the body are "resistant" (don't respond normally) to insulin.Almost half of all people with type 2 diabetes are significanty overweight. In addition, most overweight people with type 2 diabetes carry most of their excess weight around their waist, a condition called "central obesity". Those with central obesity are at a greater risk of developing type 2 diabetes than overweight people whose excess weight is not primarily located around the waist.