People could risk diabetes due to a lack of sunshine, according to new research.
Millions of people are at risk because they do not have enough vitamin D, with those who have plenty of it less likely to develop type 2 diabetes, according to Australian experts.
The body makes vitamin D naturally in the sunshine. The study's findings could play a big role in fighting the condition.
Melbourne Pathology staff tested blood among 5,200 people, and found that for every extra 25 nanomoules of vitamin D in the blood, the chances of developing diabetes was reduced by 24%.
People who have less than 50 nanomoules of vitamin D per litre have a deficiency. If a link between a deficiency and diabetes is found, then those at risk could take dietary supplements to reduce their chances of developing it.