More than half a million people in the South West are at risk of developing Type 2 diabetes, says NHS England.
Worst off are Dorset and Torbay, where over 13% of people are at risk of the disease.
The NHS' figures are based on a rise in high blood sugar levels.
West Country based scientists say they've made a major breakthrough in how to deal with diabetes.
Using new technology they've proved most people with Type 1 diabetes have active beta cells, the specialised insulin making cells that are found in the pancreas.
Jeff Welch reports.
A major breakthrough in the fight against Type 1 Diabetes has been achieved by scientists at Exeter University.
It had been thought that those affected could no longer create insulin and needed daily injections to remain healthy.
But now researchers think they can restart insulin production in the body meaning a cure is now closer than ever.
A leading diabetes consultant, Dr Patrick English, has said if nothing is done to tackle the rising diabetes problem in Plymouth, the city is looking at a time bomb.
The latest figures have revealed that there are more than 12,000 people in the city diagnosed with it and the figure is increasing by an average of 1,000 people a year. Around 90% of those diagnosed have Type 2 diabetes, which can be caused by being overweight.
Around 10% of people diagnosed have Type 1 diabetes, an auto-immune condition which cannot be prevented.
Here's our interview with Dr English
Cornwall and the Isles of Scilly are one of worst areas in England for NHS checks for diabetes. That's according to a new report by Diabetes UK out today.
Only 25 people were offered a check last year during a period in 2011/2012. They're supposed to be offered to everyone aged 40 to 74 to check for risks of diabetes, heart disease and stroke and kidney failure. Not a single person was checked between April and June 2012.
Diabetes UK has warned that the poor local implementation of the check means people in Cornwall and Isles of Scilly who are at high risk of Type 2 diabetes are missing the chance to get the information and support they need to help prevent the condition.
The Health Secretary will be in Torquay today to visit a specialist diabetes centre. Andrew Lansley will find out about its innovative services for diabetes patients at The Chilcote Practice in helping them manage their condition.