Harvard researcher Dong D. Wang has said that caffeinated coffee may form one part of the picture in the fight against dementia, while stressing that the benefit is limited. National Geographic España reported his remarks on Sunday, 1 November 2026.
According to National Geographic España, Wang described caffeinated coffee as a possible piece of the puzzle rather than a decisive factor. In the headline of its interview, the publication quoted him saying the effect is small.
The comments place coffee among the many factors researchers examine in relation to cognitive decline, but Wang's framing keeps expectations modest. National Geographic España presents his view as one element of a broader question, not a standalone answer.
The report does not include further detail on the studies behind Wang's assessment, the size of the measured effect, or how much coffee he was referring to. Those specifics are not available in the published summary.
What to watch next: whether follow-up research or fuller statements from Wang clarify how large the effect is and what amount of caffeinated coffee, if any, is linked to it.
