Experts are concerned by the high number of people in the UK with type-2 diabetes, but a new study suggests that a diet rich in vitamin C could help to reduce the risk.
Researchers at Addenbrooke's Hospital in Cambridge studied 21,831 people for 12 years.
They found that people who ate the most fruit and vegetables - which are rich in vitamin C - tended to have the lowest risk of type-2 diabetes.
Men and women with the highest levels of blood vitamin C were found to have a 62 per cent reduced risk of type-2 diabetes compared with men and women with the lowest levels of the vitamin.
The findings are published in the Archives of Internal Medicine and lead author Anne-Helen Harding wrote: "The strong independent association observed in this prospective study, together with biological plausibility, provides persuasive evidence of a beneficial effect of vitamin C and fruit and vegetable intake on diabetes risk," website NutraIngredients.com reports.
Other risk factors for type-2 diabetes include being overweight and having a family history of the disease.