September 19, 2007
Behavior, Hyperglycemia and DKA
Question from Asheville, North Carolina, USA:
How much do high blood sugars affect cognitive ability? My son has had a lot of issues at school recently, such as forgetting assignments and/or homework, materials to take home for homework or to the classroom, which is not typical behavior. His IQ is 130 and he has never been a disipline issue. Yet, since the start of school he has had five morning detentions for forgetting homework and assignments. During that time, his blood sugars were in the 250 mg/dl [13.9 mmol/L] to 400 mg/dl [22.2 mmol/L] range. We consulted our endocrinologist and made adjustments to his basal rate and insulin to carbohydrate ratio for the high blood sugars, but we are still working on stabilizing his sugars in his target range, which is 80 mg/dl [4.4 mmol/L] to 150 mg/dl [8.3 mmol/L]. I know low and high blood sugars affect concentration, staying on task and cognitive ability, but I have been unable to find out to what degree. I’m trying to be an advocate for my son and his diabetes with his teachers, but I don’t want to make excuses for him if it is not due to his blood sugars. My son also has ADD and is on Concerta.
It is unlikely all of this is related to his high sugars although chronic hyperglycemia clearly has affects on brain performance and all other types of neurological issues. This does not sound like that is the culprit, however, and I would look for other causes (i.e., omitted medication, other drugs being taken, caffeine abuse) or other psychological issues (i.e., depression).