研究發(fā)現(xiàn):早上是最不適宜喝咖啡的時(shí)段
????科學(xué)研究經(jīng)常證明,人類的某些根深蒂固的習(xí)慣其實(shí)是錯(cuò)誤的。這一次遭遇挑戰(zhàn)的習(xí)慣是:在清晨喝咖啡。 ????據(jù)YouTube科學(xué)頻道ASAP Science披露,早晨是最不適合喝咖啡的幾個(gè)時(shí)間段之一。原因在于,人體在清晨的皮質(zhì)醇水平較高。 ????皮質(zhì)醇水平較高時(shí)喝咖啡會(huì)產(chǎn)生兩個(gè)問題。首先,咖啡因會(huì)干擾身體皮質(zhì)醇的產(chǎn)生——每當(dāng)承受壓力和出現(xiàn)低血糖時(shí),人體就會(huì)釋放這種荷爾蒙。喝咖啡導(dǎo)致身體產(chǎn)生的皮質(zhì)醇減少,更加依賴作為替代物的咖啡因。 ????另外一種影響,在習(xí)慣早上喝咖啡的人群中較為常見:這種習(xí)慣會(huì)提高人體對(duì)咖啡因的耐受性,因?yàn)榭Х纫驎?huì)取代皮質(zhì)醇自然誘發(fā)的能量促進(jìn),而不是增添能量。 ????我們要記住,2009年的一項(xiàng)研究顯示,除了清晨外,人體在三個(gè)時(shí)間段的皮質(zhì)醇水平較高。所以喝咖啡或攝入咖啡因的最佳時(shí)間是在上午10點(diǎn)至中午,以及下午2點(diǎn)至5點(diǎn)。 ????習(xí)慣清晨喝咖啡的人應(yīng)該考慮調(diào)整一下時(shí)間,以進(jìn)一步優(yōu)化咖啡因的攝入。早上醒來第一件事或許是美美地喝上一杯咖啡,但事實(shí)證明,這種做法是不管用的。(財(cái)富中文網(wǎng)) ????譯者:劉進(jìn)龍/汪皓 ????審校:任文科 |
????Every so often, science disproves the thinking behind a deeply embedded habit we have. The latest: drinking coffee in the morning. ????It turns out, the morning is actually one of the worst times of the day to drink coffee, according to YouTube science channel ASAP Science. The reason? The high levels of cortisol in our bodies early in the morning. ????You see, consuming caffeine when cortisol levels are high creates two problems. One is that caffeine interferes with the body’s production of cortisol, a hormone that’s released in response to stress and low blood glucose. The body ends up producing less cortisol, and relying more on caffeine to compensate. ????The other effect of drinking coffee in the morning is well-known to habitual morning drinkers: It increases the person’s tolerance to caffeine because it replaces the natural cortisol-induced boost instead of adding to it. ????Bear in mind that cortisol levels are high at three times of the day, not just early in the morning, according to a 2009 study. So the best times to drink coffee — or caffeine in general — is between 10 a.m. and noon, and between 2 p.m. and 5 p.m. ????Early morning coffee drinkers should consider adjusting their schedule to better optimize their caffeine intake. As pleasant as a cup o’ joe may be first thing in the morning, turns out it’s quite ineffective. |