5. Fever (Elevated Body Temperature)
Fever is the body’s natural response to infection. When the immune cells detect harmful bacteria, viruses, or other pathogens associated with food poisoning, they release pyrogens that signal the hypothalamus in the brain to raise the body’s core temperature. This increase in body temperature creates a less favorable environment for the multiplication of the invaders. Fever is a sign that the immune system is actively responding to the infection, and it can help the body fight off the source of the illness.