It is important for the health of the body that the concentration of glucose in the blood be maintained at a constant level. This is usually accomplished by insulin, a hormone secreted by the pancreas that controls blood sugar levels in the body. But for various reasons, the process doesn’t work correctly for people with diabetes. The American Diabetes Association reports the following as possible reasons an individual’s blood glucose levels may spike: eating something that contains more carbohydrates than you normally eat, insufficient exercise, hormonal changes, being sick, and emotional stress. American Diabetes Association, June 2016