Why is blood glucose an absolute requirement for human life?

Answer 1

glucose is fuel for the body. glycolysis makes ATP which is essential for the body to function

Answer 2

Functions
Used by hospitals, sports enthusiasts, and everyone in between as a potent fast-energy source, Glucose is easily absorbed into the bloodstream.
Glucose enhances memory, stimulates calcium absorption, and increases cellular communication. However, too much can raise insulin levels, leading to obesity and diabetes; but too little can cause hypoglycemia or worse, insulin shock (diabetic coma).
Vital to brain function, Glucose metabolism is disturbed in depression, manic-depression, anorexia, and bulimia. In addition, Alzheimer’s patients, for instance, register much lower glucose levels than those with other forms of brain malfunction that resulted from stroke or other vascular disease. Researchers found that a dietary supplement of 75 grams of Glucose increased performance on a number of memory tests and reached across a broad range of cognitive tasks.
Absorbed into liver cells, Glucose reduces the secretion of Glucagon, resulting in an increased uptake of Glucose by muscle and fat tissue cells. Excess blood Glucose levels is converted to fatty acids and triglycerides by the liver and fat tissues.
Normal amounts of Glucose at a level that did not cause digestive symptoms has a beneficial effect on intestinal flora, especially that of bifidobacteria, vital for proper digestion and nutrient uptake.
Researchers have also discovered a significant reduction in ratings of urges to smoke when smokers were given Glucose tablets to chew compared to groups who were given Sorbitol tablets. This finding suggests a glucoregulation link and cigarette cravings. In preliminary work, scientists are finding the same theory holds true for alcoholics.

Safety
The safety of Glucose consumption is well known – North Americans consume far too much of this sugar, as much as 4-times the daily recommended limit. Consuming too much Glucose suppresses the immune system, resulting in a host of chronic diseases and disorders ranging from the common cold to malabsorption syndromes, diabetes, and obesity.
How much Glucose is too much or what is the minimum requirement is an individual question. It depends on how much alcohol is consumed, antibiotics or antimicrobial foods taken, metabolic energy requirements, and so on. But it is safe to say, that very few people are even close to being deficient.


Dietary Sources
There is obviously no shortage of Glucose in the average diet, but the following list (mg. of Glucose per 100 grams of food) provides some better sources of dietary Glucose than that found in processed foods:
Honey (33,900), Grapes (7,300), Bananas (7,000), Cherries (6,600), Strawberries (2,000), Mangoes, Cocoa, Aloe Vera, Licorice herb, Sarsaparilla, Hawthorn, Garlic, Kelp, and Echinacea.

References
Mondoa, Emil I. MD and Mindy Kitei. Sugars that Heal. Ballantine Publishing, 2001.
Elkins, Rita MH. Miracle Sugars. Woodland Publishing, 2003.
Glycoscience website (This site prohibits direct linkage.)
http://www.lis.net.au/~dbird/glyconutrients.htm (A glyconutrient site by Dr David Bird MbChB, Dip Clinical Nutrition, FACNEM [Fellow of the Australian College of Nutritional and Environmental Medicine])

Answer 3

Glucose is a critical component in the ATP cycle.

http://muscle.ucsd.edu/musintro/glucose.shtml

Answer 4

Because blood glucose is the fuel your muscles need to work. No blood glucose - no muscle movement, in particular, no heartbeat, no you!