1. Nausea
Most people who get infected with a food-borne pathogen present with nausea, a constant feeling of needing to vomit. It is often the first sign of food poisoning, an involuntary reaction of the body after a person ingests something that has been contaminated, usually occurring a few minutes to a couple of hours after eating, as it tries to expel stomach contents to eliminate the infection. Drinking clear liquids, most importantly water, helps relieve the symptoms and prevents an affected person from dehydrating.
