Findings suggest smaller cognitive decline, but US study cannot prove daily caffeine hit is good for the brain Findings suggest smaller cognitive decline, but US study cannot prove daily caffeine hit is good for the brain People who have a couple of teas or coffees a day have a lower risk of dementia and marginally better cognitive performance than those who avoid the drinks, researchers say. Health records for more than 130,000 people showed that over 40 years, those who routinely drank two to