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Food odors are more enticing to sleep-deprived brains

Activity boost seen in areas linked to olfaction

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7:00am, April 2, 2017
cinnamon role

SLEEPY SNACKING  The brain appears to have a heightened response to food smells when sleep deprived, new research suggests.

SAN FRANCISCO — The nose knows when you’re tired.

Sleep deprivation seems to increase the brain’s sensitivity to food smells, researchers reported March 27 at the Cognitive Neuroscience Society’s annual meeting in San Francisco. That might make snacks more enticing — helping explain why people who burn the candle at both ends tend to eat more and gain weight.

Adults operating on only four hours of sleep inhaled food odors such as those from potato chips and cinnamon rolls, and nonfood smells like fir trees while undergoing functional MRI scans. (The scientists carefully controlled participants’ food intake throughout the day.) A few weeks later, the same participants repeated the experiment — this time with a full eight hours of sleep.

When tired, participants showed greater brain activity in two areas involved in

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