The survey of 2,010 children also found that 10% believe parsnips grow on trees, pears only grow in pairs, and believe ham does not come from pigs.
Lucinda Bruce-Gardyne, founder of Genius Gluten Free, told the Daily Mail: 'It is so important that children learn about where their food comes from and different dietary requirements from a young age, and it's equally important they are aware of the symptoms associated with different food allergies.
“The research has also shown food allergies to be having a negative impact on children in the classroom, with half saying classmates with allergies missed out on enjoying birthday cake.”
A fifth of the children surveyed were also unaware butter comes from an animal and 6% think that chocolate grows on trees in perfect squares.
Four fifths now have a classmate with an allergy, but almost a quarter think it’s still okay to eat scrambled eggs if you have an egg allergy.
Over half (56%) of kids have no idea what the word gluten means, with many believing it’s a type of glue or sugar.