Numerous studies connect diabetes and Alzheimer’s Disease.
A study in 2004 examined the association between type II diabetes, high insulin levels, and Alzheimer’s risk. A total of 683 men and women were followed and examined for signs of Alzheimer’s and increased insulin levels. As in the earlier study, the scientists found that high insulin levels, which are intimately connected to type II diabetes, were significantly correlated with a higher risk of developing Alzheimer’s.
Luchsinger JA, Tang MX, Shea S, Mayeux R. Hyperinsulinemia and risk of Alzheimer disease. Neurology. 2004 Oct 12;63(7):1187-92.
The possible mechanism by which high insulin levels are linked to Alzheimer’s was elucidated in a 2005 study published in the Archives of Neurology. Researchers showed that by mimicking high insulin levels (such as those seen in patients with insulin resistance and type II diabetes) in 16 healthy men ranging in age from 55 to 81, they were able to elevate inflammatory markers and beta amyloid levels in the brain, two characteristics of Alzheimer’s disease.
Fishel MA, Watson GS, Montine TJ, et al. Hyperinsulinemia provokes synchronous increases in central inflammation and beta-amyloid in normal adults. Arch Neurol. 2005 Oct;62(10):1539-44.