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Blood sugar levels above 300 mg/dL can cause fatal reactions. Ketones will be very high (a magnitude higher than when eating a very low carbohydrate diet) initiating ketoacidosis. The Mayo Clinic recommends emergency room treatment above 300 mg/dL blood glucose. The most common cause of hyperglycemia is diabetes.
Hypoglycemia, also called low blood sugar or low blood glucose, is a blood-sugar level below 70 mg/dL (3.9 mmol/L). [ 3 ] [ 5 ] Blood-sugar levels naturally fluctuate throughout the day, the body normally maintaining levels between 70 and 110 mg/dL (3.9–6.1 mmol/L).
Diabetic hypoglycemia is a low blood glucose level occurring in a person with diabetes mellitus. It is one of the most common types of hypoglycemia seen in emergency departments and hospitals. According to the National Electronic Injury Surveillance System-All Injury Program (NEISS-AIP), and based on a sample examined between 2004 and 2005, an ...
Ketotic hypoglycemia refers to any circumstance in which low blood glucose is accompanied by ketosis, the presence of ketone bodies (such as beta-hydroxybutyrate) in the blood or urine. This state can be either physiologic or pathologic; physiologic ketotic hypoglycemia is a common cause of hypoglycemia in children, often in response to ...
The consequent fall in blood glucose is indicated as the reason for the "sugar crash". [4] Another cause might be hysteresis effect of insulin action, i.e., the effect of insulin is still prominent even if both plasma glucose and insulin levels were already low, causing a plasma glucose level eventually much lower than the baseline level. [5]
Despite widely variable intervals between meals or the occasional consumption of meals with a substantial carbohydrate load, human blood glucose levels tend to remain within the normal range. However, shortly after eating, the blood glucose level may rise, in non-diabetics, temporarily up to 7.8 mmol/L (140 mg/dL) or slightly more.
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There is some evidence of the existence of a so-called "adrenergic postprandial syndrome": the blood glucose level is normal, and the symptoms are caused through autonomic adrenergic response. [6] Often, this syndrome is associated with emotional distress and anxious behaviour of the patient. [7] [8]