Well, let's imagine that our beta cells, for one reason or another, aren't able to produce enough insulin. And that means we have a low amount of insulin inside our blood. And so if we don't have enough insulin, not too many of those glucose molecules will be transported into the cells from our blood plasma and that will basically create a hyperglycemia condition. So the condition of a high concentration of glucose inside our blood. Now, another reason might be because our insulin is unable to actually bind to the protein receptor. And if the interaction between the insulin and the receptor isn't good, that means our glucose molecules cannot move into our cells.