Diabetes is usually a lifelong (chronic) disease in which there is a high level of sugar in the blood.
Insulin is a hormone produced by the pancreas to control blood sugar. Diabetes can be caused by too little insulin, resistance to insulin, or both.
To understand diabetes, it is important to first understand the normal process by which food is broken down and used by the body for energy. Several things happen when food is digested:
People with diabetes have high blood sugar because their body cannot move sugar into fat, liver, and muscle cells to be stored for energy. This is because either:
There are two major types of diabetes. The causes and risk factors are different for each type:
Gestational diabetes is high blood sugar that develops at any time during pregnancy in a woman who does not have diabetes.
Diabetes affects more than 20 million Americans. Over 40 million Americans have pre-diabetes (which often develops before type 2 diabetes). If your parent, brother or sister has diabetes, you may be more likely to develop diabetes.
High blood sugar level can cause several symptoms, including:
Because type 2 diabetes develops slowly, some people with high blood sugar have no symptoms.
Symptoms of type 1 diabetes develop over a short period. People may be very sick by the time they are diagnosed.
After many years, diabetes can lead to other serious problems. These problems are known as diabetes complications and include:
A urine analysis may show high blood sugar. But a urine test alone does not diagnose diabetes.
Your health care provider may suspect that you have diabetes if your blood sugar level is higher than 200 mg/dL. To confirm the diagnosis, one or more of the following tests must be done.
Screening for type 2 diabetes in people who have no symptoms is recommended for:
With type 2 diabetes, the disease may be reversed with lifestyle changes, especially losing weight through exercising and eating healthier foods. Also, some cases of type 2 diabetes can be improved with weight-loss surgery.
There is no cure for type 1 diabetes.
Getting better control over your blood sugar, cholesterol, and blood pressure levels helps reduce the risk of kidney disease, eye disease, nervous system disease, heart attack, and stroke.
To prevent diabetes complications, visit your health care provider at least two to four times a year. Talk about any problems you are having. Follow your health care provider's instructions on managing your diabetes.
American Diabetes Association | www.diabetes.org
Keeping an ideal body weight and an active lifestyle may prevent type 2 diabetes.
Type 1 diabetes cannot be prevented.
Alemzadeh R, Ali O. Diabetes mellitus. In: Kliegman RM, ed. Kliegman: Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 583.
Amorosa LF, Lee EJ, Swee DE. Diabetes mellitus. In: Rakel RE, Rakel DP, eds. Textbook of Family Medicine. 8th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 34.
American Diabetes Association. Standards of medical care in diabetes -- 2013. Diabetes Care. 2013; Jan;33 Suppl 1:S11-S61.
Eisenbarth GS, Polonsky KS, Buse JB. Type 1 Diabetes Mellitus. In: Kronenberg HM, Melmed S, Polonsky KS, Larsen PR. Kronenberg: Williams Textbook of Endocrinology. 11th ed. Philadelphia, Pa: Saunders Elsevier; 2008:chap 31.