Diabetes Mellitus is a metabolic disorder characterized by High Blood Sugar or what we called Hyperglycemia, Hyperglycemia. There are other signs as distinct from a single disease or condition. There are three main form of diabetes, World Health Organization (WHO) said. These are type 1, type 2, and Gestational Diabetes (diabetes that affects pregnant women who have never had 
diabetes before). All these form have similar signs and symptoms but have different causes. Type 1 is formerly known as "childhood," "juvenile," or "insulin-dependent" diabetes. It is an autoimmune disorder in which the body’s own immune system attacks the beta cells in the Islets of Langerhans of the Pancreas and destroying them to reduce and eliminate Insulin (hormone secreted by the B cells of the islets of Langerhans) production. The autoimmune attack may be triggered by reaction to an infection. Example of this is German measles or Rubella. Type 2 is characterized by tissue-wide insulin resistance and varies widely; it sometimes progresses to loss of beta cell function. Gestational Diabetes is no known specific causes but the hormones of the victim produced during pregnancy reduce a woman’s receptivity to insulin resulting in high blood sugar. This is also similar to Type 2 diabetes. In point of fact, there are two types of Gestational Diabetes. Type A1, diet modification is sufficient to control glucose level. Type A2, Insulin or other medications are required.
Now, is it possible to prevent types of diabetes? Here are some diabetes preventions and information.
Source: http://www.reference.com/
