However, patients with a blood caffeine level above 1,200 ng/ml did not develop the disease over the 2-4 year study period. For these individuals, the main (or only) source of caffeine was coffee.
The study's lead author said “These intriguing results suggest that older adults with mild memory impairment who drink moderate levels of coffee -- about 3 cups a day -- will not convert to Alzheimer's disease -- or at least will experience a substantial delay before converting to Alzheimer's."
"The results from this study, along with our earlier studies in Alzheimer's mice, are very consistent in indicating that moderate daily caffeine/coffee intake throughout adulthood should appreciably protect against Alzheimer's disease later in life," he continued.
However, one thing I'll say to add to this discussion is that it's premature to attribute the benefits to caffeine. A similar study I covered last year (click HERE to read, it's the second study I discuss in the post) suggested it was some unknown substance found in coffee. Interestingly, the results suggested this unknown substance may require the presence of caffeine to realize the full benefits, a synergistic action boosting the health benefits of both.
Source: High Blood Caffeine Levels in MCI Linked to Lack of Progression to Dementia
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Other posts on coffee studies:
- coffee may protect against endometrial cancer
- benefiting blood sugar and fat metabolism and another one on its anti-diabetic effects
- protecting against Alzheimer's Disease
- potentially inhibiting some breast cancers
- preventing prostate cancer
- protecting DNA from free-radical damage and assisting in weight loss
- reducing the risk of brain tumours (many studies covered in this post... you'll find this study about halfway down
- coffee may prevent fatty liver fibrosis