Caffeine also appears to reduce inflammation and regulate blood sugar metabolism, says a professor. LOUGHBOROUGH, England: Scientists have found that drinking two to three cups of coffee a day may significantly reduce your risk of developing dementia, but drinking more won’t help protect your brain any further. A major study tracked 131,821 American nurses and health professionals for up to 43 years, starting when they were in their early 40s. During this time, 11,033 people – around 8 per cent