詼諧的語言，生動的內(nèi)容一分鐘快速掌握科技最新動態(tài)

>>本期節(jié)目音頻下載<<

Anorectic Brain Responds to Food Anxiously
大腦絕食引發(fā)的后果

Meatloaf, mac-and-cheese or a big bowl of mashed potatoes. We all have our comfort foods. Except for people with anorexia. Food makes them extremely uncomfortable. Perhaps because eating causes a change in brain chemistry that instead of bringing pleasure makes anorectics feel anxious. That’s according to a study in the International Journal of Eating Disorders. [Ursula Bailer et al., "Amphetamine-Induced Dopamine Release Increases Anxiety in Individuals Recovered from Anorexia Nervosa," link to come]
我們都喜歡享用烘肉卷，芝士通心粉，或許還有一大碗土豆泥這些爽心的美食。當(dāng)然，除了那些 患有厭食癥的人。因為食物會讓他們十分的不舒服。這有可能是因為他們吃東西的時候，大腦中產(chǎn)生愉悅情緒的化學(xué)物質(zhì)發(fā)生改變，變得厭食和焦躁。此項研究發(fā)表 在《國際進食障礙雜志》上。[Ursula Bailer et al., "Amphetamine-Induced Dopamine Release Increases Anxiety in Individuals Recovered from Anorexia Nervosa," link to come]

For most people, breaking bread makes them feel good. That’s because consuming food stimulates the release of dopamine, a chemical that tickles the pleasure centers of the brain. But for people with anorexia, meals are fraught with anxiety. So much so that some of these women, and the disease affects mostly women, actually diet themselves to death. But how could biology promote such behavior?
對于大多數(shù)人來說，進餐是件很愉快的事情。因為消化食物會刺激多巴胺（一種刺激大腦愉悅中樞的化學(xué)物質(zhì)）的釋放。但對于厭食人群來說，吃飯令人焦躁?；紖捠嘲Y的人群中以女性居多，而厭食的女性事實上都絕食而死。但為何生物會產(chǎn)生如此舉動？

To find out, scientists gave volunteers a single dose of amphetamine, a drug that gets the dopamine flowing, and then looked at their brains. In women without an eating disorder, the boost in dopamine acted as expected, lighting up the brain’s pleasure centers. But in women with anorexia, dopamine flooded a part of the brain that worries about consequences, thus fueling their anxiety. Seeing where this anxiety comes from could be the first step to help making it disappear.
為找 出原因，科學(xué)家讓自愿者們服用單次量安非他明（解除憂郁、疲勞的藥），這種藥物可以提高多巴胺的含量，然后檢查他們的腦部。在沒有飲食障礙的女性大腦中， 多巴胺刺激大腦愉悅中樞。但是在患有厭食癥的女性大腦中，多巴胺充斥著大腦的憂慮區(qū)域，從而引發(fā)焦躁不安的情緒?？茖W(xué)家想消滅厭食癥的第一步就是找出這種 焦躁從何而來。

—Karen Hopkin

點擊進入?yún)⑴c科學(xué)60秒查看背景資料和單詞總結(jié)>>>


聲明：音視頻均來自互聯(lián)網(wǎng)鏈接，僅供學(xué)習(xí)使用。本網(wǎng)站自身不存儲、控制、修改被鏈接的內(nèi)容。"滬江英語"高度重視知識產(chǎn)權(quán)保護。當(dāng)如發(fā)現(xiàn)本網(wǎng)站發(fā)布的信息包含有侵犯其著作權(quán)的鏈接內(nèi)容時，請聯(lián)系我們，我們將依法采取措施移除相關(guān)內(nèi)容或屏蔽相關(guān)鏈接。