"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 three cups of caffeinated coffee or one to two cups of caffeinated tea daily had a 15-20% lower risk of dementia than those who went without."
"Coffee and tea contain caffeine and polyphenols that may protect against brain ageing by improving vascular health and reducing inflammation and oxidative stress, where harmful atoms and molecules called free radicals damage cells and tissues. Substances in the drinks could also work by improving metabolic health. Caffeine, for example, is linked to lower rates of type 2 diabetes, a known risk factor for dementia."
Health records for 131,821 people across two large US public-health cohorts with repeated dietary and cognitive assessments over about 40 years found routine consumption of two to three cups of caffeinated coffee or one to two cups of caffeinated tea daily associated with a 15–20% lower risk of dementia compared with no consumption. Caffeinated coffee drinkers reported slightly less cognitive decline than decaf drinkers and performed better on some objective cognitive tests. Potential protective mechanisms include caffeine and polyphenols improving vascular health, reducing inflammation and oxidative stress, and improving metabolic health; caffeine is linked to lower type 2 diabetes rates. Associations do not prove causation and confounding factors may explain the link.
Read at www.theguardian.com
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