A new longitudinal investigation studied 5,189 people over 10 years. It found that people with high blood sugar had a faster rate of cognitive decline than those with normal blood sugar. This was true whether or not their blood-sugar level technically made them diabetic. In other words, the higher the blood sugar, the faster the cognitive decline.

Below are three media articles about the study:

The Startling Link Between Sugar and Alzheimer’s

Faster Cognitive Decline Tied to Hyperglycemia

Diabetes link to long-term mental decline

And here is a link to the formal study itself:

HbA1c, diabetes and cognitive decline: the English Longitudinal Study of Ageing

These four links have all been added to Health > Diet and Alzheimer’s > Risk Factors.