1 . Carrot
Actually, carrots don’t make your eyes sharp. Carrots were only propagated by the British during the war against Germany. At that time, the British succeeded in making a sophisticated tool such as a radar to detect targets mounted on the nose of the plane.
The detailed explanation is like this 
This is the main point. The British, under the direction of the Ministry of Food, created a cover story to hide their revolutionary new air-to-air radar, called the Airborne Interception radar.
Fact
RThis radar was installed on the Bristol Beaufighter and De Havilland Mosquito night fighters.
RAF pilots such as John, later nicknamed Cat’s Eyes, Cunningham, began shooting down Luftwaffe bombers in complete darkness with previously impossible accuracy.
The Germans were therefore suspicious: “How is that possible? Do they have some kind of new detection device?”
This is where the Ministry of Food & RAF collaborate. Instead of admitting the existence of radar which would have prompted the Germans to pursue the technology they spread a brilliantly fabricated story to the media that Captain Cunningham & our pilots had super night vision thanks to a diet of carrots.
This story is very fitting because
Scientifically, at a glance, it makes sense why carrots contain beta-carotene, a precursor to vitamin A, which is important for eye health. Vitamin A deficiency causes night blindness. So, the basic premise is there.
This also provides a simple explanation for complex phenomena. Eating carrots = being able to see in the dark. clear goals for/
Avoiding the technological areaGermany could have underestimated the British, thinking they were just relying on silly diet tricks.
This is not just a military matter. This is a clever domestic economic campaign. At that time, England was under a blockade by German U-Boat submarines which cut off food import routes.
So that The situation
Sugar, meat, and fat are strictly rationed.
On the other hand, carrots can be grown on British soil easily, without needing imported ships, and the harvest is abundant. England has a huge surplus of carrots.
But the problem is, carrots are boring and don’t taste as good as sugar/meat. How to make people willing to eat it in large quantities?
The answer is, tie it to patriotism & superpowers.
Ministry of Food launches doctor Carrot character, posters & bombastic recipes. The campaign went something like: “Eat carrots, help our pilots see at night, help us win the war.”
The result
Civilians planted “Victory Gardens” full of carrots.
· They experimented with carrots as a sugar substitute (made imitation jams, fat substitutes, and even “carrot ice cream”.
· Consumption of carrots has increased drastically. Food crisis resolved. Everyone felt like they were contributing directly to the air battle above their heads.
This turns “eating vegetables because you have to” into “a patriotic act that gives you superpowers.”
Layer 3: Eternal Creation of Myth
This is the most extraordinary side effect. This propaganda was so successful that the myth outlived the war itself.
· Mothers all over the world, including those who know nothing about World War II & radar, pass on the myth of “eating carrots to keep your eyes sharp” to their children.
· This is a classic example of how a health “fact” can arise from the needs of military intelligence, rather than from actual medical findings. Beta-carotene is important, but it won’t give you super night vision, let alone radar-sharp.
· Ironically, perhaps frustrated Luftwaffe pilots also munched on carrots, hoping to match the “cat eyes” of RAF pilots.
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