Type 2 Diabetes is caused by two things. First, the body does not respond to insulin. Also, the body does not produce enough insulin.
Initially, the pancreas produces large amounts of insulin to try to compensate for the body's inability to use it properly. Gradually, however, the pancreas is able to make less and less insulin. Eventually it cannot meet the body's insulin requirements. When this happens, the blood sugar level rises and a person develops diabetes. Some individuals have more insulin production than others. This is why some people with type 2 diabetes can take oral medications to control their blood sugar levels while other patients need insulin injections.
Excessive body weight and lack of exercise make type 2 diabetes much worse. Exercise and weight loss remove sugar from the bloodstream. This decreases the amount of insulin the body needs. Exercise and weight loss are very important to prevent type 2 diabetes from worsening.
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Click here to learn more about type 2 diabetes from the American Diabetes Association.