The amount of sugar in the blood is usually controlled by a hormone called 'insulin', which is produced by the pancreas (a gland behind the stomach).
When food is digested and enters your bloodstream, insulin moves glucose out of the blood and into cells, where it is broken down to produce energy.
However, if you have diabetes, your body cannot break down glucose into energy. This is because there is either not enough insulin to move the glucose, or the insulin produced does not work properly. Glucose builds up in the blood resulting in high blood glucose levels.
If you are concerned you may have diabetes please see your doctor.
Last reviewed: August 2016