STRESS raises the risk of [...].
A team at Edinburgh University studied more than 900 men and women aged between 60 and 75 with Type 2 diabetes, which tends to affect the over 40s.
The study found brain function slowed in those with higher levels of the stress hormone cortisol. Tests were carried out on participants which assessed their memory and how quickly they could process information.
Factors including education, cardiovascular disease, smoking and mood were taken into account. Blood samples were taken to assess levels of cortisol. Scientists believe regulating cortisol levels could stave off cognitive decline.
Dr Rebecca Reynolds, of Edinburgh University's Centre for Cardiovascular Science, said: "We know Type 2 diabetes is linked to problems with memory, but the reason behind this is unclear."