The findings showed that those with Type-2 diabetes had a 31 per cent greater risk of a later diagnosis of Parkinson's disease than those without diabetes. The risk was even higher for younger people aged 25 to 44. In addition those with complications from diabetes had a 49 per cent greater risk of a later diagnosis of Parkinson's disease than people without the disease. Read: World Parkinson’s Day 2018: 15 early signs of Parkinson’s disease Restoring the brain's ability to use insulin could potentially have a protective effect on the brain said Thomas T. Warner from Britain's University College London (UCL).