Hypoglycemia means low blood sugar. The normal range is 70 to 120 mg/dl after an over night (12 hours) fast. In healthy men, the blood glucose can drop to 55 mg/dl after 24 hours of fasting and to 48 mg/dl after 72 hours of fasting. Whereas, in healthy women, glucose level can be as low as 35 mg/dl after only 24 hours of fasting. Hypoglycemia causes the body to release adrenaline. The adrenaline functions to restore and maintain blood glucose levels by mobilizing stored glycogen and fat, converting them into glucose. In return, the released adrenaline causes symptoms of nervous symptoms stimulation, such as anxiety, sweating, tremor, palpitations, nausea and pallor. Hypoglycemia also starves the brain of glucose energy, which is essential for the proper brain function. Lack of glucose energy to the brain can cause symptoms ranging from headache, mild confusion, abnormal behavior, loss of consciousness, seizure and coma. Severe hypoglycemia can cause death.