Frustrated1

This is a third in a series of questions regarding some of my therories on what affects me. My last question surrounds Nitrates and some preservatives (Sodium nitrates et al)
If you are not exposed to these substances for a time, like a year, could this also be a trigger that could generate IBS

WOuld these symptoms pass over time or would you continually sensitive to these substances?

Thanks for indulging me in my questions