Junk food is more appealing to you, if you are sleep-deprived, because sleepy brains associate junk food with reward and pleasure. The sight of junk food, however, does not activate the reward centers of well-rested brains in the same way.
If you are a Sleep-deprived individual, you are drawn to junk food because, when you are fatigued, your body would want calorie-dense foods that give you quick energy,
A new study that used brain scans of people who had not had enough sleep suggests junk food may be more appealing to tired brains. The sight of unhealthy food during a period of sleep restriction activated reward centers in the brain that were less active when participants had adequate sleep,
Scientists found that when normal weight volunteers looked at unhealthy food during a period of sleep restriction, the reward centers in their brains were more active than when they looked at the pictures after having slept regularly.
Researchers from St. Luke’s – Roosevelt Hospital Center and Columbia University in New York performed functional magnetic resonance imaging (fMRI) on 25 men and women of normal weights while they looked at images of healthy and unhealthy foods. The scans were taken after five nights in which sleep was either restricted to four hours or allowed to continue up to nine hours. Results were compared.
“The same brain regions activated when unhealthy foods were presented were not involved when we presented healthy foods,” said Marie-Pierre St-Onge, PhD, the study’s principal investigator. “The unhealthy food response was a neuronal pattern specific to restricted sleep. This may suggest greater propensity to succumb to unhealthy foods when one is sleep restricted.”
Previous research has shown that restricted sleep leads to increased food consumption in healthy people, and that a self-reported desire for sweet and salty food increases after a period of sleep deprivation. St-Onge said the new study’s results provide additional support for a role of short sleep in appetite-modulation and obesity.
The results suggest that, under restricted sleep, individuals find unhealthy foods highly salient and rewarding, which may lead to greater consumption of those foods, St-Onge said. Food intake data from this same study showed that participants ate more overall and consumed more fat after a period of sleep restriction compared to regular sleep. The brain imaging data provided the neuro-cognitive basis for those results.
St-Onge said the findings support the idea that insufficient sleep affects appetite regulation and obesity.
The study also showed that participants ate more overall and ate more fat, after restricted sleep than they did after regular sleep.
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