Researchers at King’s College London took 42 adults who typically slept five to seven hours a night and had half of them get more shut-eye. They all wore sleep trackers and kept food journals. Four weeks later, those who slept less ate 10 grams more added sugar than their better-rested counterparts equivalent to a handful of M&Ms.
“It might just be that going to bed earlier reduced their opportunities for late-night snacking,” says researcher Wendy Hall. “But evidence also suggests that sleep deprivation increases the brain’s reward mechanisms, which govern the desire for highly palatable foods.” Munchies, anyone?