Lexi Petronis, Glamour magazine
You know how when you fly from, say, Athens to New York City, you're sleepy, out of it, and just generally weird for a few days until your body and brain adjust to your new time zone? (Not that I've ever experienced that exact flight pattern. Yet.) Well, research is showing that you could be putting yourself through something similar every single week--and it may be affecting your weight.
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If your sleep schedule changes between weekends and weekdays, researchers from the University of Munich's Institute of Medical Psychology say you could be experiencing "social jet lag": the difference between your body's own natural time clock (which it likes to stick to on weekends, when you can sleep in) and the prescribed clock to which you're forced to adhere (setting the alarm to get up early enough to make it to work or class on time).
The result? Your body basically goes back and forth between two