Blood sugar level In humans, glucose is the primary source of energy, and is critical for normal function, in a number of tissues, particularly the human brain which consumes approximately 60% of blood glucose in fasted, sedentary individuals. Glucose can be transported from the intestines or liver to other tissues in the body via the bloodstream. Cellular glucose uptake is primarily regulated by insulin, a hormone produced in the pancreas. Glucose levels are usually lowest in the morning, before the first meal of the day, and rise after meals for an hour or two by a few millimoles. Blood sugar levels outside the
Blood sugar level case of a "fight and flight" response. Lastly, cortisol supplies the body with fuel in times of heavy stress. If blood sugar levels remain too high the body suppresses appetite over the short term. Long-term hyperglycemia causes many long-term health problems including heart disease, cancer, eye, kidney, and nerve damage. Blood sugar levels above 300 can cause fatal reactions. Ketones will be very high (a magnitude higher than when eating a very low carbohydrate diet) initiating ketoacidosis. Mayo clinic recommends emergency room treatment above 300 mg/dL blood glucose. The most common cause of hyperglycemia is diabetes. When diabetes is the