Diabetes is a life-long disease marked by high levels of sugar in the blood.Causes, incidence, and risk factors.
Diabetes
can be caused by too little insulin (a hormone produced by the pancreas to control blood sugar), resistance to insulin, or both.To understand
diabetes, it is important to first understand the normal process of food metabolism. Several things happen when food is digested:
A sugar called
glucose enters the bloodstream. Glucose is a source of fuel for the body.
An organ called the pancreas makes insulin. The role of insulin is to move glucose from the bloodstream into muscle, fat, and liver cells, where it can be used as fuel.
People with diabetes have high blood sugar. This is because their pancreas does not make enough insulin or their muscle, fat, and liver cells do not respond to insulin normally, or both.
There are three major types of diabetes:
Type 1 diabetes is usually diagnosed in childhood. The body makes little or no insulin, and daily injections of insulin are needed to sustain life.
Type 2 diabetes is far more common than type 1 and makes up most of all cases of diabetes. It usually occurs in adulthood. The pancreas does not make enough insulin to keep blood glucose levels normal, often because the body does not respond well to the insulin. Many people with type 2 diabetes do not know they have it, although it is a serious condition.