胡蘿卜能改善夜視有根源嗎

You may have been told to eat more carrots to help with night vision, but where did this advice come from? It dates back to World War II when the British Air Force successfully gunned down German aircraft in the middle of the night. It was pitch black; how did they do it without any technology to help them see? The UK Ministry of Food (which no longer exists) claimed it was because the pilots ate a lot of carrots (via Scientific American). There was even a propaganda campaign about how the pilots' carrot diet improved their night vision so well that they could take down enemy planes in the dark. These advertisements encouraged civilians to do the same thing to help them function better during blackouts.

你可能被告知多吃胡蘿卜來幫助改善夜視，但這個建議是從哪里來的呢?這要追溯到第二次世界大戰(zhàn)，當(dāng)時英國空軍在半夜成功擊落了德國飛機。漆黑一片;在沒有任何技術(shù)幫助的情況下，他們是如何做到的?英國食品部(現(xiàn)已不復(fù)存在)聲稱這是因為飛行員吃了很多胡蘿卜。甚至還有一場宣傳運動，說飛行員的胡蘿卜飲食改善了他們的夜視能力，使他們能夠在黑暗中擊落敵機。這些廣告鼓勵市民多吃胡蘿卜，以幫助他們在停電時更好地工作。

But it wasn't a diet rich in carrots that helped the British Air Force defeat German aircraft; it was new radar technology used to spot and shoot down enemy planes. They wanted to hide the fact that they had this technology, so someone came up with the carrot diet — but they weren't wrong about carrots' health benefits (via Berkeley Wellness).

但幫助英國空軍擊敗德國飛機的并不是富含胡蘿卜的飲食;而是一種新的雷達技術(shù)，用于發(fā)現(xiàn)并擊落敵機。他們想隱瞞他們有這項技術(shù)的事實，所以有人提出了胡蘿卜飲食法——但他們對胡蘿卜有益健康的看法沒有錯。

How carrots help eye health

胡蘿卜如何幫助眼睛健康

Whoever came up with the carrot diet rumor during World War II might have known that carrots are actually good for your eyes. Carrots contain beta carotene, which our bodies turn into retinal, a form of vitamin A, which is essential for eye health. Most people get enough vitamin A through a healthy diet. Some people are vitamin A deficient due to a poor diet, alcoholism, or problems with absorbing the vitamin. In some cases, a lack of vitamin A due to a poor diet or malnutrition can cause blindness. Vitamin A does help people see in low light conditions. If you don't get enough vitamin A, your cornea (the clear part in the front of your eyes) can disappear.

無論是誰在二戰(zhàn)期間提出了胡蘿卜飲食的謠言，他可能都知道胡蘿卜對眼睛有好處。胡蘿卜含有β -胡蘿卜素，我們的身體會將其轉(zhuǎn)化為視網(wǎng)膜，這是維生素A的一種形式，對眼睛健康至關(guān)重要。大多數(shù)人通過健康飲食獲得足夠的維生素A。有些人由于飲食不良、酗酒或吸收維生素有問題而缺乏維生素A。在某些情況下，由于飲食不良或營養(yǎng)不良而缺乏維生素A會導(dǎo)致失明。維生素A確實能幫助人們在弱光條件下看清東西。如果你沒有獲得足夠的維生素A，你的角膜(你眼睛前面的透明部分)就會消失。

The vitamin A from carrots isn't going to allow you to see in the dark, but it can help with age-related macular degeneration (AMD), according to the Age Related Eye Disease Study (AREDS). The study found that a supplement containing beta carotene, vitamin C, copper, vitamin E, and zinc helped keep people with intermediate AMD from progressing into advanced AMD, which leads to blindness.

根據(jù)年齡相關(guān)眼病研究(AREDS)，胡蘿卜中的維生素A不能讓你在黑暗中看清東西，但它可以幫助治療老年性黃斑變性(AMD)。研究發(fā)現(xiàn)，含有β -胡蘿卜素、維生素C、銅、維生素E和鋅的補充劑有助于防止中度AMD患者發(fā)展為導(dǎo)致失明的晚期AMD。

How much vitamin A do you need? Adult women need 700 micrograms, and adult men need 900 micrograms of vitamin A daily (via National Institutes of Health Office of Dietary Supplements).

那么你需要多少維生素A?成年女性每天需要700微克，成年男性每天需要900微克的維生素A。