Decoded: Why we crave junk food after sleepless night?

Researchers have figured out why people crave more calorie-dense, high-fat foods such as doughnuts, chocolate chip cookies, and potato chips after a sleepless night, and how to help thwart those unhealthy choices. According to the study, published in the journal eLife, our nose -- or olfactory system -- is affected in two ways by sleep deprivation. First, it goes into hyperdrive, sharpening the food odours for the brain so it can better differentiate between food and non-food odours. Then there is a breakdown in the communication with other brain areas that receive food signals, and with that our decisions about what to eat change, the researchers said.

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