Don't pick your nose

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A study published in 2022 revealed a tenuous but plausible link between picking your nose and increasing the risk of developing dementia.

In cases where picking at your nose damages internal tissues, critical species of bacteria have a clearer path to the brain, which responds to their presence in ways that resemble signs of Alzheimer's disease.

There are plenty of caveats here, not least that so far the supporting research is based on mice rather than humans, but the findings are definitely worth further investigation – and could improve our understanding of how Alzheimer's gets started, which remains something of a mystery.