Which of the following is a symptom of foodborne illness?

Nausea and vomiting are key symptoms of foodborne illness, and they typically occur as the body’s response to harmful pathogens or toxins that may have been ingested through contaminated food or water. These symptoms often manifest quickly after consumption and serve as a protective mechanism, helping to rid the body of the offending substances.

Other symptoms associated with foodborne illness can include diarrhea, abdominal cramps, and fever, which also highlight the body's effective response to infection or intoxication. It is important to recognize these signs early, as they indicate that the body is experiencing a reaction that may require medical attention depending on severity and duration.

Increased appetite and dry skin do not relate to foodborne illness; rather, they reflect conditions that are not indicative of an adverse reaction to food consumption. Fatigue might occur in some cases but is more general and not specific enough to be a defining symptom of foodborne illness.