Type II Diabetes is a form of diabetes mellitus that is commonly known as adult diabetes. This is because the onset of Type II diabetes typically occurs later in life. Unlike Type I diabetes, Type II diabetes can frequently be attributed to an unhealthy lifestyle. Adult onset diabetes is commonly defined by decreased insulin production or sensitivity, and many of those who suffer from it experience a combination of both. Treatment for Type II diabetes depends on its cause, and can include adherence to a healthy diet and exercise plan or to medication which may include pills or insulin. Diabetes is a chronic disease that affects the metabolic system and traditionally causes either insulin deficience or inability of the body to process insulin and use it effectively. Those with Type II diabetes may experience one or both of these. Symptoms of Type II diabetes include increased thirst and urination, and sometimes increased appetite. Type II diabetics may also experience severe lethargy and nausea. Many of those who suffer from Type II diabetes can treat the disease simply by following a healthy eating plan and regular exercise regimen. This form of treatment is typically useful to those who suffer from insulin resistance, as it improves the body's ability to process sugars and produce energy. Others may require oral medication, usually pills, that improve insulin sensitivity and increase insulin production. These types of medications may be used to improve the abilities of insulin already in the body, either to increase the amount produced or to improve the body's ability to process it. Those with more severe symptoms may require insulin injections. Typically, the frequency of injections is dependent on the severity of the disease and the level of control over it. Adult diabetes is the most common form of diabetes mellitus, affecting over 90% of adult diabetics. Effective treatment is vital to improving overall health and avoiding the more serious effects of diabetes.