Fast food restaurants are notorious for bad food handling. Dropping it on the floor, mouse feces present in the food....employees not washing their hands....or wearing their gloves....etc. I used to run one, it is impossible to get the kids that work there to do it right. IF you will notice...almost ALL FF places are run by kids. They do not have a clue about clean food, and proper handling....temperatures etc........I would say your intestines could not handle what was put in them. If you only knew.
NO ONE would eat at FF if they only knew.