Slows or prevents.
Two types of illness:
intoxication- a preformed toxin affects your gut.
Infection- organism in food actually infects lining of gut.
Both result in temporary disruption of ability to digest food and absorb nutrients.
Most 1st world illness is short lived and mild. Some can be severe. Persistent symptoms, elderly, recent antibiotics, severe abd pain or blood in stool
should prompt eval.