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The Importance of Glucose

author image Leigh Ann Morgan
Leigh Ann Morgan began working as a writer in 2004. She has extensive experience in the business field having served as the manager of a $34 million rental property portfolio. Morgan also appeared as a guest on an episode of National Public Radio's "Marketplace Money" in 2005.
The Importance of Glucose
A young girl is rating candy. Photo Credit kolinko_tanya/iStock/Getty Images

The human body requires glucose for some of its most important functions. This simple sugar provides the energy needed to perform specialized processes such as digestion and cellular respiration. Problems with the amount of glucose in the blood result in serious complications that could lead to coma or even death if not corrected quickly.

Chemical Composition

Glucose contains six atoms of carbon, 12 atoms of hydrogen and six atoms of oxygen, giving it a chemical formula of C6H12O6. Glucose found in the blood and cells of humans consists of molecules arranged in the shape of a hexagon.


Glucose serves as the primary energy source for the brain and is also a source of energy for cells throughout the body. This energy helps the cells carry out nerve cell conduction, muscle cell contraction, active transport and the production of chemical substances. When you eat foods that contain starches, enzymes from the saliva and pancreatic juices break them into maltose molecules. The small intestine makes glucose molecules by splitting the maltose. The bloodstream then carries the glucose to the liver for storage or for use as an energy source.

Hypoglycemia and Hyperglycemia

Hypoglycemia occurs when blood glucose levels fall below normal. Normal fasting blood glucose levels range from 70 to 99 mg/dL, according to the University of Michigan Health System. Low blood sugar levels cause confusion, anxiety, weakness, hunger, dizziness, shakiness and difficulty speaking. Hyperglycemia occurs when blood glucose levels rise above normal. This condition causes frequent urination, excessive thirst and high levels of glucose in the blood and urine.


Diabetes is one of the most common disorders associated with glucose. In people without diabetes, a hormone called insulin carries glucose from food into the cells of the body. People with diabetes do not use insulin properly or do not make enough insulin in the pancreas. As a result, the glucose remains in the bloodstream instead of entering the cells, causing high blood glucose levels. Signs of diabetes include excessive thirst, unintended weight loss, dry skin, blurry eyesight, excessive hunger, fatigue, frequent urination and tingling in the feet.


Some people believe that glucose levels change only in response to eating sugary snacks and drinks. Because the body makes glucose from the maltose in food, any food that contains carbohydrates affects blood sugar levels. These foods include fruits, vegetables, breads and pasta. Physical activity and the use of diabetes medications also affect the amount of glucose in the bloodstream.


Because glucose has so many important functions in the body, discuss any concerns about your glucose levels with a doctor. Restrictive diets that drastically reduce the consumption of carbohydrates can lead to serious complications. If you have diabetes, carefully follow your diet, exercise and medication plans. Do not stop taking your medication or change the amount of insulin you take without supervision by a physician.

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