There's apparently a fairly contested research area of bilingualism being neuroprotective against cognitive decline in old age, such as dementia.

What are the main points for and against this hypothesis?

  • $\begingroup$ Cognitive decline may be better correlated with diet. See Steven Gundry's The Plant Paradox. $\endgroup$ – Frank Hubeny Sep 18 '18 at 3:48
  • $\begingroup$ Could you shortly summarize what you already know based on the linked article? $\endgroup$ – Steven Jeuris Sep 18 '18 at 10:56
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    $\begingroup$ @AliceD: yes, I will, but I need work on it a little beforehand, because it's easier to refute a point than to provide a somewhat balanced summary. $\endgroup$ – Fizz Sep 19 '18 at 7:37

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