Ok, not sure how to ask this so you know what I mean....

I recently bought a preservative free cordial. Its not something I have every really been concerned about (and to be honest I doubt I ever really will be) But a friend (you all know her as FireFly) is right into the preservative free thing & got me wondering. Anyway I was looking on the net at what code it what & what the related risk is to that preservative. Now my question is, if the risks listed are things like allergic reaction (rashs etc) or asthmatics should avoid. Does that mean its only bad fro people who 1 have a reaction to it or 2 are asthmatic?
I understand that allergies can be someting that appears later in life. But if the risks listed don't apply because (I will use myself as an example) I don't have asthma or allergies, then is it still a risk and should therfor be avoided?
Like peanuts, I know they have the risk of allergic reactions, but I don't have an allergy to nuts so I don't have to avoid them KWIM?

Also what about preservatives that are also naturally occouring in some foods. Like Sodium benzoate (211). Its linked to a number of food intolerances but it also naturally occurs in things like pruns & apples. So why should it be avoided in cordial (for example) when I am exposing my self by eating an apple.

Does any of that make sence to anyone? Please remember I am pregnant LOL.