The findings by research company Datamonitor show that the allergy rate among children is a bit higher than it is in grown-ups.
However, the research also shows that many children will grow out of their allergies.
Experts say that there is confusion because many people have food intolerances but think these are actually allergies.
They can be life-threatening
Real allergies can be very serious and are sometimes life-threatening, but food intolerances aren't as serious and cause problems like asthma or bad headaches.
The most common triggers of true food allergies are peanuts, milk and seafood, and they can be triggered by as little as 1/1,000th of a peanut.