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Diabetes causes blood glucose (sugar) levels to rise higher than normal. This is also called hyperglycemia. Type 2 diabetes is the most common form of diabetes. The average age for diagnosis is 9 to 14 but you can still be diagnosed as a young child or adult. There is no cure for Type 1 and injecting insulin is the only treatment.  Symptoms range from thirst, frequent urination, tiredness and weight loss. 

Type 2 diabetes usually appears in people over the age of 40, though in South Asian people, who are at greater risk, it often appears from the age of 25. It is also increasingly becoming more common in children, adolescents and young people of all ethnicities. Type 2 diabetes accounts for between 85 and 95 per cent of all people with diabetes and is treated with a healthy diet and increased physical activity.

Insulin is a hormone and is made in the pancreas. It works like a messenger helping the body use glucose in blood to give you energy. Glucose cannot enter the cells and be used as fuel without it. 

With Type 1 diabetes the body is unable to produce insulin meaning there is (no key to unlock the door). Glucose then builds up in the blood. This is when problems arise. The body can't use glucose without insulin so tries to get it elsewhere so starts to break down stored fat and protein instead. This can cause weight loss. Because the body doesn’t use the glucose it ends up passing into the urine.

Scientists don't really knows why insulin-producing cells are destroyed, but the most likely cause is the body having an abnormal reaction to the cells. This may be triggered by a virus or other infection.