Losing too much shuteye may leave you feeling hungry like the wolf, a study in Sleep Medicine Reviews confirmed. Going on four hours of sleep two nights in a row caused levels of the hormone leptin, which rings the satiety bell, to fall by 18 percent, while the hormone ghrelin, which promotes chowing down, increased by 28 percent. Catch more zzzs (aim for seven hours a night) to avoid unwanted lbs. Source: Tanya Zuckerbrot, R.D., author of the Miracle Carb Diet
