I don't understand what food poisoning is. I've heard that it's something to do with too much bacteria that produce toxins in the body:
Food poisoning is a common...and sometimes life-threatening problem for... people... throughout the world. People infected with food-borne organisms may... have symptoms ranging from mild intestinal discomfort to severe dehydration and bloody diarrhea. Depending on the type of infection, people can even die as a result of food poisoning
It is associated with, for example, Campylobacter, Salmonella, Shigella, E. coli O157:H7, Listeria, botulism, and norovirus.
If that's the case, then wouldn't it just be called an infection instead of food poisoning?