大多数有关食欲的研究都集中在激素所扮演的角色上,但近几年,有人发现,即使老鼠的肠道内激素水平保持不变,它们也会食欲不振。最近一项研究或可解释为什么。研究人员发现,吃高脂肪食物的老鼠,若在它们的食物中添加植物纤维,体重就会增加得慢一些。他们用仪器跟踪老鼠体内一种叫“醋酸纤维素”的物质。醋酸纤维素是植物纤维被消化的时候,在肠道内生成的。传统上认为,当新陈代谢时,醋酸纤维素最多只能到达肝脏。但让研究人员吃惊的是,一些醋酸纤维素竟然 Most studies of appetite have focused on the role of hormones, but in recent years it has been found that even when the hormone levels in the intestine of mice remain constant, they lose appetite. A recent study may explain why. Researchers found that rats who ate high-fat foods gained weight more slowly by adding plant fiber to their diet. They tracked rats with something called “cellulose acetate”. Cellulose acetate is produced in the gut when plant fibers are digested. Traditionally, cellulose acetate only reaches the liver at most when it is metabolized. But to the surprise of the researchers, some cellulose acetate unexpectedly