Some foods cause a lot more allergy trouble than others. Peanuts, the nuts that grow on trees, milk, eggs, wheat, soya, fish, the wobbly sea creatures like prawns, and sesame seeds are the usual suspects.
The tricky part isn't the food sitting on a plate looking like itself. It's the food hiding. Milk hides in bread. Egg hides in the shiny stuff brushed on top of a pie. Sesame hides absolutely everywhere, like a very small ninja.
That's why grown-ups read the little list of ingredients on the packet. The list says what somebody put in on purpose. It doesn't say what fell in by accident, which is a different puzzle, and that puzzle has its own page.
If somebody in your class can't have a food, it isn't because the food is horrible. It's because their body has picked a fight with it. The food is perfectly ordinary for everybody else and a real problem for them, and both of those are true at the same time.
A food nobody has ever heard of causing trouble is still an enormous deal for the one person it troubles. Unusual doesn't mean small. My gills are unusual and they are enormous.
I know where allergens like to hide. I don't know what's in the thing in front of you right now — the person who cooked it does, and they're the one worth asking.
Questions this page raises
Ezzie will have a go at any of these.