The sweet smell of ageing

What does the smell of a good meal mean to you? It may mean more than you think. Specific odours that represent food or indicate danger are capable of altering an animal's lifespan and physiological profile by activating a small number of highly specialised sensory neurones, researchers at the University of Michigan, University of Houston, and Baylor College of Medicine have shown in a study publishing next week in the online, open-access journal PLoS Biology...

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