Researchers from the University of Edinburgh have found that stress can increase the risk of memory loss in older people with diabetes type one or two.
However, a spokeswoman from the Insulin Dependent Diabetes trust has suggested that this may not be the case.
Highlighting the complexity of the illness, the spokeswoman said: "Diabetes type 1 and type 2, is too complicated an issue and can be affected by many different factors - including the different types of insulin such as, animal, human, analogues which substantially affect patient's stress levels."
She confirmed: "We don't feel that this particular research proves conclusively that an increased risk of memory loss is caused by the disease."
The scientists at Edinburgh studied over 900 men and women aged between 60 and 75 who were suffering from type 2 diabetes.
Their research found a slowing in brain function among participants with higher levels of the stress hormone cortisol.