Only one percent of adults and four percent of children have a true food allergy.
That's when your body reacts to a food like it was a poison . You might swell up, get a rash or have breathing problems.
One of the most dangerous allergic reactions can be to certain types of nuts, which sends sufferers into a very serious anaphylactic shock.
Many other things, including strawberries, apples, garlic and onions can cause problems too.