A small study led by Dr. Elizabeth Thomas, a professor of medicine at the University of Colorado, showed that when overweight women skipped breakfast, they developed insulin resistance. When this happened, they needed more insulin to get their blood sugar back to normal levels.
According to the study, the insulin resistance of the participants was short-lived. But if this disorder becomes chronic, it becomes a risk factor for diabetes. Excess weight, on the other hand, constitutes in itself another risk factor.