It can usually be what's inside the food. But it could be from the ingredients or what's it made of. But sometimes it just depends on how it was made or how long its been around. That's a good question.
how long has deforestation been around
As long as guns have been around.
For as long as they last.
how long has the london eye been around for
As long as So Random has been around.
234 years fool
how long have boxing been around?
boner
They have always been around
well some people have sensitive bodies that react to different things. everyone is allergic to something it could be theyve just never been around that thig that makes the allergies pop in on them.
Allergies to polpropylene can have all sorts of symptoms. I've been formally diagnosed as allergic. If I eat anything that has been stored in polypropylene for a long period of time my throat constricts, my mouth is intantly full of ulcers and the roof of my mouth itches.