A very early study links two languages to lower risk, and four or more to lower risk still
The claim comes from an unnamed, very early study mentioned in Tokyo, plus a question about dialects.
This Week in Startups · Why this longevity startup raised in Japan, not Silicon Valley | TWiST Tokyo | E2315A very early, unnamed study reported onstage in Tokyo said people who know a second language had what was described as dramatically lower chances of Alzheimer's and Parkinson's, and people who speak four languages or more had lower chances still.
Startup investor Jason Calacanis, speaking with Bilal Karoui, the French founder of AK Labs, a longevity startup that reads chemical tags that switch genes on and off, said he had seen the study in the past week and stressed that it was very early.
Calacanis suggested the idea might involve plasticity, the brain's ability to stay flexible, saying it was almost like working out and that a mind juggling multiple languages might stay healthier.
Karoui replied that he had read the study too, and wondered if blue zones, the places known for longevity, are also places with more dialects, and therefore more brain health. Calacanis noted that brain disease sits with heart and lung disease among the major killers.
Questions people ask
Does this prove that learning another language prevents Alzheimer's?
No. Most work on bilingualism and dementia is observational, so people who learn languages may differ in schooling, income, immigration history, or health care. Researchers treat language as linked to lower risk or later symptoms, not as proven protection, especially for a very early study like this one.
How could speaking more languages help the brain?
The leading idea is cognitive reserve. Managing two or more languages exercises attention, switching, and inhibition, which may help the brain cope longer with damage. It does not stop Alzheimer's plaques or Parkinson's loss of dopamine cells, but it may delay when problems show up.
Would speaking dialects count the same as speaking separate languages?
Possibly, if you use them often and in different settings. Studies usually count distinct languages, and dialect use is harder to measure. Karoui's question is only a hypothesis, that places with more dialects give brains more of a workout.