When was this understanding updated?

The evidence had largely shifted by around 1945. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.

Is "Eating a lot of carrots will give you excellent night vision" true?

Eat your carrots and you'll see in the dark like an owl, went the lunchroom promise, helped along by British wartime propaganda that needed a cover story for radar-assisted night fighter pilots. Carrots really do supply vitamin A, and vitamin A really does prevent deficiency-related vision problems. Somewhere between "prevents deficiency" and "grants night vision," the claim ran way past what carrots can actually do for eyes that already work just fine.

What you were taught

Eating a lot of carrots will give you excellent night vision

What we know now

Carrots provide vitamin A, which helps prevent deficiency-related vision problems, but they do not give healthy people superhuman night vision. The myth was amplified by World War II propaganda.

Updated understanding emerged around 1945

Source Comment

Health

Common questions

Was "Eating a lot of carrots will give you excellent night vision" taught in school?: Yes — and not as a joke question on a quiz. This health claim showed up in textbooks, worksheets, and classroom posters through the 1970s, which is why so many people still remember it as settled fact long after the science moved on.
Is "Eating a lot of carrots will give you excellent night vision" true?: No. Carrots provide vitamin A, which helps prevent deficiency-related vision problems, but they do not give healthy people superhuman night vision. The myth was amplified by World War II propaganda. If you want the primary citation, start with Smithsonian - The World War II Myth of Carrots and Night Vision.
When was this understanding updated?: The evidence had largely shifted by around 1945. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.

Is "Eating a lot of carrots will give you excellent night vision" true?

Common questions

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