Do you sleep enough everyday? Or do you always stay up late? ...Well, I suggest you to sleep enough. Because it's revealed that if you sleep for only few hours, you gain weight. According to the research done by Columbia University, people who sleep for under 5 hours are 73% more likely to be obese than those who sleep for 7 hours.
Then, why if we don't sleep enough, we gain weight? It's because of the two hormones: "leptin" and "grehlin". Grehlin makes us feel hungry, while leptin regurates our appetites. If you don't sleep enough, the power of grehlin becomes strong but that of leptin becomes weak. So, we feel more hungry than usual and eat much food.
For example, here's a result of the experiment that University of Chicago Medical Center. Researchers made fine young men sleep only for 4 hours a day, and those men ate food 24% more than when they sleep for more than 4 hours. In addition, they ate food like candies, cookies, nuts, chips, pasta and bread, which have many calories.
We Become Obese If We Don't Sleep Enough ? (Japanese)
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