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Self-control impaired in Type 2 diabetics, research suggests

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NEW YORK Poor impulse control in patients with Type 2 diabetes may be caused by neurological changes, a new study published in BioPsychoSocial Medicine suggested.

In a small study study, Hiroaki Kumano, from Waseda University, Japan, worked with a team of researchers to assess response inhibition, a measure of self-control, in 27 patients with Type 2 diabetes and 27 healthy controls.

In order to gauge the patients' ability to resist such impulsive behavior, the researchers used a test in which participants had to quickly press a button in response to the correct signal on a computer screen, while pressing the button in response to the wrong symbol counted against their score. They found that patients with diabetes performed significantly worse at the test, suggesting that they struggled to control the impulse to press the button.

Other results showed that the inhibitory failure observed in diabetic patients was mainly explained by cognitive impairment of impulsivity control, rather than by deficits in motor performance, error monitoring and adjustment.

"Patients with Type 2 diabetes are required to make strict daily decisions; for example, they should resist the temptation of high-fat, high-calorie food, which is frequently cued by specific people, places and events. Appropriate behavior modification thus depends on the patient's ability to inhibit impulsive thoughts and actions cued by these environmental stimuli," Kumano said. "This suggests the possibility that the neuropsychological deficits in response inhibition may contribute to the behavioral problems leading to chronic lifestyle-related diseases, such as Type 2 diabetes."

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