There is an interesting and seemingly not well-understood link between loss of sense of smell and decreased longevity: https://www.health.harvard.edu/diseases-a

There is an interesting and seemingly not well-understood link between loss of sense of smell and decreased longevity: https://www.health.harvard.edu/diseases-and-conditions/poor-sense-of-smell-may-predict-risk-of-death-in-older-adults https://www.health.harvard.edu/diseases-and-conditions/poor-... Wild speculation, but maybe there is some key circuitry in our brains that also doesn’t activate if we cannot smell?