Sweating, weakness, dizziness, shakiness, and rapid heart rate are examples of symptoms of hypoglycemia (hypo = low; glycemia = blood sugar). Since the brain is critically dependent upon blood sugar as its primary fuel, when hypoglycemia becomes more severe, the brain is seriously affected. In such cases, symptoms of hypoglycemia can range from mild to severe and include such things as: headache, depression, anxiety, irritability, blurred vision, excessive sweating, mental confusion, incoherent speech, bizarre behavior, lack of coordination, and later, if blood sugar goes below critical levels, convulsions, coma, and even death. Insulin- or medication-treated diabetics need to develop a keen awareness of hypoglycemia because serious hypoglycemia episodes can be dangerous. Unfortunately, the bodies of many diabetics become less sensitive to the initial adrenaline-related signs of impending hypoglycemia over time (sweating, weakness, rapid heart rate, etc.). These individuals must develop an ability to monitor subtleties of their brain function instead in an effort to achieve good blood sugar control and avoid catastrophic hypoglycemic episodes.