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I’m not familiar with the research but I will say that conclusion “feels” right to me.

Have they found a modern day metric that we should all be hunting in our quest for reading health? A literary equivalent to the daily 10,000 steps?

Maybe 10,000 words!

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There is also a weird, robust mortality relationship where book readers live longer than periodical readers "regardless of gender, health, wealth, or education" [1]. In those studies, the threshold was 30 minutes of book reading a day.

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC5105607/

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