Daily vitamin D supplements do not seem to prevent the development of Type 2 diabetes in people already at high risk of the condition, finds a study.

Type 2 diabetes affects around 480 million people worldwide, and is predicted to increase to 700 million by 2045. Another half a billion people have impaired glucose tolerance or pre-diabetes, or higher than normal blood sugar levels that, if left untreated, can develop into Type 2 diabetes.