Dr. Rachel Witmer, a medical researcher reviewed health records for 29,961 type 2 diabetes patients over the age of 60. They found that over the course of the ten-year study roughly 17 percent of all patients developed dementia.
They cross checked each patient for any combination of 45 different risk factors including age, depression, heart disease, heart attack history and cerebrovascular disease. Using those statistics the researchers were able to break patients down in 14 different tiers of dementia risk. They found that those in highest predicted risk categories did, in fact, develop dementia more frequently.