More than 150 million people worldwide are affected by diabetes, but many are undiagnosed. According to the World Health Organization (WHO) the total number of people worldwide with diabetes will double by the year 2025.

There are two main forms of diabetes, type 1 diabetes and type 2 diabetes. These have different typical ages of onset and different causes, though in both forms of the disease a combination of genetic and environmental factors appears to be involved.

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