Research from Northwestern University has linked staying up late—and then sleeping in the next morning—to weight gain. Study subjects who went to bed after midnight, woke up mid-morning, and ate their first meal of the day around noon consumed more calories a day, ate more fast food, and consumed fewer fruits and vegetables than those who routinely went to bed before midnight and woke up around 8 a.m. each morning. Bottom line: If your weekly routine has you going to bed relatively early each night and waking up early for work every morning, keep up with that routine on weekends.
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