研究生科技英语阅读课文翻译对照(39)

Unit 8 Why We"re Fat
So why is obesity happening? The obvious, clichéd-but-true answer is that we eat too much high-calorie food and don"t burn it off with enough exercise. If only we had more willpower, the problem would go away. But it isn"t that easy.
为什么会有肥胖症？一个明显、老生常谈但又真实的答案就是我们吃太多高热量食物并且没有进行足够的运动消耗它。要是我们的意志力更强大，这个问题便迎刃而解了。但是，问题并不是那么简单。
When warned about the dangers of overeating, we get briefly spooked and try to do better. Then we"re offered a plateful of pancakes smothered in maple syrup, our appetite overpowers our reason, and before we know it, we"re at it again. Just why is appetite such a powerful driver of behavior, and, more important, how can we tame it?
当我们被警告说吃得太多的时候，一时总会被吓倒并努力做好一些。然后一碟涂满槭糖浆的煎饼摆在面前，我们的食欲战胜了我们的理智，等到我们意识到它的时候，我们又重蹈覆辙了。到底为什么食欲具有如此强大的推动力？更重要的是，我们怎么才能够控制它？
itWhin the past few years, science has linked our ravenous appetites to genes and hormones. Among the hormones that fuel these urges are ghrelin and leptin, known as the "hunger hormones." Ghrelin is produced mostly by cells in the stomach lining. Its job is to make you feel hungry by affecting the hypothalamus, which governs metabolism. Ghrelin levels rise in dieters who lose weight and then try to keep it off. It"s almost as if their bodies are trying to regain the lost fat. This is one reason why it"s hard to lose weight and maintain the loss.