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That doesn’t mean caffeine is some kind of miracle anti-dementia elixir, sadly depriving Silicon Valley of its next “biohack your brain” pitch deck. The researchers are careful to point out that the findings are observational, meaning that they can spot patterns but can’t prove cause and effect.
I can’t help but feel that dubious extrapolations from research happen all the time, even when researches provide cautions with their findings.
I.e. People who volunteer for studies have less risk of dementia.