If you have physical symptoms after eating a nominal food item, you do not tolerate it.
Others may consume it with no difficulty. This might be a food dye like red #40 that can cause cramping and diarrhea
, or lactose sugar
in milk for those that cannot digest it. You do not have to be allergic to it to be intolerant, but if you are allergic to a food you are intolerant to that food.