Moderate daily consumption of caffeinated coffee or tea was associated with a reduced risk of dementia and better cognitive function over time. A prospective study of health professionals followed participants for a median of 36.8 years. Regular coffee consumption may reduce the risk of dementia in people with hypertension, especially with half to one cup of coffee or four to five cups of tea per day. Higher intake of caffeinated coffee, especially unsweetened, was associated with a reduced risk of Alzheimer's disease, Parkinson's disease and related dementias. Older people who regularly drink coffee have a lower risk of dementia, according to an analysis of medical records from the UK. Those who drank higher amounts were 34 percent less likely to develop Alzheimer's disease and 37 percent less likely to develop Parkinson's disease compared to those who drank less. Higher consumption of more than six cups of coffee per day was associated with a 53 percent higher risk of dementia and reduced brain capacity.