Or it can also be due to the inability of the insulin to actually bind to the protein receptor on the target cell membrane. In fact, people that have a consistently high concentration of glucose inside their blood system, people that consistently experience this condition of hyperglycemia, are said to have diabetes mellitus. So basically, diabetes comes in two forms, and this depends on the abnormality of the insulin. So we have type one diabetes and type two diabetes. Type one diabetes is the less common diabetes, while type two is the much more common diabetes. So in people with type one diabetes, what happens is their beta cells are destroyed for one reason or another.