胡萝卜能改善夜视有根源吗

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萝卜来帮助改善夜视，但这个建议是从哪里来的呢?这要追溯到第二次世界大战，当时英国空军在半夜成功击落了德国飞机。漆黑一片;在没有任何技术帮助的情况下，他们是如何做到的?英国食品部(现已不复存在)声称这是因为飞行员吃了很多胡萝卜。甚至还有一场宣传运动，说飞行员的胡萝卜饮食改善了他们的夜视能力，使他们能够在黑暗中击落敌机。这些广告鼓励市民多吃胡萝卜，以帮助他们在停电时更好地工作。

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).

但帮助英国空军击败德国飞机的并不是富含胡萝卜的饮食;而是一种新的雷达技术，用于发现并击落敌机。他们想隐瞒他们有这项技术的事实，所以有人提出了胡萝卜饮食法——但他们对胡萝卜有益健康的看法没有错。

How carrots help eye health

胡萝卜如何帮助眼睛健康

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.

无论是谁在二战期间提出了胡萝卜饮食的谣言，他可能都知道胡萝卜对眼睛有好处。胡萝卜含有β -胡萝卜素，我们的身体会将其转化为视网膜，这是维生素A的一种形式，对眼睛健康至关重要。大多数人通过健康饮食获得足够的维生素A。有些人由于饮食不良、酗酒或吸收维生素有问题而缺乏维生素A。在某些情况下，由于饮食不良或营养不良而缺乏维生素A会导致失明。维生素A确实能帮助人们在弱光条件下看清东西。如果你没有获得足够的维生素A，你的角膜(你眼睛前面的透明部分)就会消失。

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.

根据年龄相关眼病研究(AREDS)，胡萝卜中的维生素A不能让你在黑暗中看清东西，但它可以帮助治疗老年性黄斑变性(AMD)。研究发现，含有β -胡萝卜素、维生素C、铜、维生素E和锌的补充剂有助于防止中度AMD患者发展为导致失明的晚期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).

那么你需要多少维生素A?成年女性每天需要700微克，成年男性每天需要900微克的维生素A。