Food odors decrease longevity via a brain–gut axis
2021
Zhang et al. describe a neural circuit that reduces lifespan when food-restricted worms smell food. This circuit signals the intestine via octopamine, the invertebrate homolog of norepinephrine, to activate AMPKα. Importantly, norepinephrine signaling also activates AMPKα in mammalian cells, suggesting a conserved mechanism.
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