There are two forms of diabetes – type 1 and type 2. It is still not yet known what exactly causes type 1 diabetes, while type 2 is usually linked to being overweight, inactive or a family history. Type 2 is far more common – affecting 3.8 million people in the UK.
Both types of diabetes result in the level of glucose (sugar) in your blood becoming too high.
For type 1 patients this happens when your body cannot produce enough of a hormone called insulin, which controls blood glucose.