When the head rotates or tilts, the otoliths in the vestibule sacs shifts, causing the fluid in the semicircular canals to move, bending hair cells, which turn in activate neural signals and notify them about the head's position and movement. The vestibule nerve connects with the cochlear nerve to form the auditory nerve, which relays information to the brain about balance.
Common food borne illnesses are things like salmonella, E. coli, and listeria. I’m naming these since they are the most common, and the easiest way to avoid them is by ensuring the food is cooked thoroughly.