首页
登录
职称英语
Eating when you’re not hungry—especially high-calorie, high-fat foods—may no
Eating when you’re not hungry—especially high-calorie, high-fat foods—may no
游客
2024-11-27
26
管理
问题
Eating when you’re not hungry—especially high-calorie, high-fat foods—may not always rise to the newly broadened clinical definition of an eating disorder. But the behavior that for many Americans is a routine pastime certainly contributes to excess weight gain, with its implications for health. And it is considered "disordered eating" by most mental health professionals.
A study published Thursday in the journal Science adds to evidence that binge eating—and overeating generally may have a biological basis. The new research, conducted on mice, suggests a target in the brain that drug developers should consider in exploring treatments for such disordered eating.
Not surprisingly, researchers focused their attention on the hypothalamus, one of the brain’s most primitive structures, a key node in the brain circuitry that drives us to eat and drink, to seek out sexual partners, and generally to crave more of what makes us feel good. From its seat in the brain’s deepest recesses, the lateral hypothalamus is lashed up to the amygdala, where basic, powerful emotions such as fear, anger and love are processed.
As part of the limbic system, these structures evolved early in the rise of mammals to ensure that the necessities for survival and reproduction got top billing in behavior.
In the 1960s, neuroscientists electrically stimulated the lateral hypothalamus and saw that it played a key role in feeding behavior, and in the reinforcement of feeding behavior. But how it did that remained a mystery.
To explore how the lateral hypothalamus governs eating behavior, a group of researchers from the University of North Carolina used mice and a relatively new technique: To discern how certain cells work, they genetically engineered the cells to respond to light; then, they turned those cells on and off, essentially, with a miniature flashlight, and watched the resulting behavior.
The researchers applied the on-off treatment to a group of cells in the amygdala and their projections into the lateral hypothalamus. They hypothesized that the cells, called the bed nucleus of the stria terminalis, interact with the hypothalamus to regulate eating.
Sure enough, when they "turned on" these unique cells in mice who were well fed, the result was rapid and striking: The animals immediately launched into "voracious feeding behavior". And the mice clearly enjoyed the impulse to pig out: They showed a clear preference for being in the space they associated with having the cells turned on.
Moreover, given the choice, the animals made a beeline to high-fat, high-calorie foods.
The trick worked more dramatically when the mice’s food was restricted and they were then allowed to eat at will. But even when the mice were well fed, those with the targeted cells turned on continued to eat well after they would have been filled up.
Research has suggested that stress, genes and environmental factors, such as the ubiquity of high-calorie, high-fat foods, all may trigger overeating. But if future therapies aim to fortify the vulnerable against those triggers, they might well focus on the special cells targeted here, the researchers said. [br] What can be implied from the research?
选项
A、A person whose parents have got eating disorder may overeat.
B、A person who overeats has to receive a therapy.
C、Special cells have to be changed to cure eating disorder.
D、It doesn’t matter if we overeat something low in calorie.
答案
A
解析
推断题。最后一段第一句提到“Research has suggested that stress,genes and environmental factors,such as the ubiquity of high-calorie,high—fat foods,all may trigger overeating.”,选项[A]的意思是“若家长饮食失调,孩子也可能会饮食过量”,定位句中所提到genes和该选项提及的内容一致,所以[A]为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3863400.html
相关试题推荐
Eatingwhenyou’renothungry—especiallyhigh-calorie,high-fatfoods—mayno
Eatingwhenyou’renothungry—especiallyhigh-calorie,high-fatfoods—mayno
ChristmasisusuallyconnectedtoA、thereunionofalargefamily.B、theeatingo
Greateffortsshouldbemadetoinformyoungpeopleespeciallythedreadfulcons
吃头两个主菜时,也是赞不绝口。(2004年真题)Youwillbefullofpraisewhileeatingthefirsttwoma
Peopletendtostrugglewhenlearninganotherlanguage,especiallyiftheya
Peopletendtostrugglewhenlearninganotherlanguage,especiallyiftheya
Peopletendtostrugglewhenlearninganotherlanguage,especiallyiftheya
Peopletendtostrugglewhenlearninganotherlanguage,especiallyiftheya
Peopletendtostrugglewhenlearninganotherlanguage,especiallyiftheya
随机试题
Theyknowundergroundlendingisvery______becauseofthehighinterestrates,b
菌体两端有异染颗粒,在吕氏血清斜面上生长迅速的革兰阳性杆菌是A.痤疮丙酸杆菌
下列委托加工行为中,受托方(非个体工商户)应代收代缴消费税的有()。A、汽车制
患者,男,68岁。因感冒伴发口唇成群小水疱,破溃后呈糜烂与结痂,自觉瘙痒,灼热。
在抽样框中每隔一定距离抽选样本单位的调查方式是()。A.整理抽样 B.系统
下列( )图例表示地下采空区。
目前我国社会组织包括()。 A.国有企业B.基金会 C.民办非企业单位D
超市以4320元的价格购进某品牌核桃180斤,计划按获利出售,但是价签却把售价的
根据票据法律制度的规定,下列表述不正确的是( )。A.票据债务人不得以自己与出
一个国家的居民可以在国际收支所有项目下,自由地将本国货币与外国货币兑换则该国实现
最新回复
(
0
)