Carrots help you see in the dark.
for grown-ups
What we actually know
Not in the way the saying means. Your eyes do need vitamin A, and your body makes it from the beta-carotene in carrots (and in plenty of other foods). People who don't get enough vitamin A can develop night blindness, and getting enough again fixes it. But for someone who already gets enough, eating more carrots doesn't give them better night vision.
The saying got a big push from a story told on purpose. In the Second World War, Britain's airmen began finding enemy planes at night using a new, secret airborne radar. British officials let the public believe the pilots' night vision came from eating lots of carrots, and the newspapers praised one night-fighter pilot, John "Cat's Eyes" Cunningham, as proof. The Ministry of Food liked the story too, since carrots were plentiful while other food was rationed ("A carrot a day keeps the blackout at bay"). Historians still argue about whether the aim was to mislead the enemy or mostly to sell carrots at home, so the round says only that the story kept a secret machine secret.
The round's real subject is a source with a stake. "Everybody says it" is lots of tellings, not a record. The question one step further back is who said it first, and whether they had a reason to want you to believe it.
Sources: Smithsonian Magazine, "A WWII Propaganda Campaign Popularized the Myth That Carrots Help You See in the Dark" (2013), with John Stolarczyk of the World Carrot Museum; University of Texas, "Think Twice: Does eating carrots give you night vision?" (2022); Popular Science, on carrots and eyesight. The RAF Museum's Bryan Legate has argued the story was never really meant to fool German intelligence.
What kids usually bring
- "Grown-ups always tell me to eat my carrots for my eyes." Being told by people who love you is a real where-from. The round asks who told them.
- "Carrots are good for you." True. Is "good for you" the same as "makes you see in the dark"?
- "Rabbits eat carrots, and they see well." Do they see well because of carrots, or because they're rabbits?
- "I eat carrots, and I still can't see in the dark." Checking it on yourself. So did the Duck.
- "Food can't change your eyes." Too little vitamin A really can. That's different from more giving you night eyes.
- "Someone told me it's not true." Also being told. The round shows whose story it was, and why.
At dinner
Ask: "When everybody says something, how could we find out who said it first?" Then tell the radar story together, and think of another saying you've always heard. Who might have wanted people to believe it?
Then the one rule: say their reason back before you give yours.
The round never tells your child what to think. This card tells you what we know, so you're never caught out. If your child wants to argue with it, that is the point.
