What is a common symptom of foodborne illness?

Nausea is a common symptom of foodborne illness because it is one of the body's natural responses to harmful bacteria, viruses, or toxins in ingested food. When the gastrointestinal system detects these harmful substances, it can trigger nausea as a protective mechanism to expel the contaminants, often leading to vomiting. This reaction is essential for preventing further absorption of the pathogens and is often accompanied by other symptoms such as diarrhea, stomach cramps, and fever. Recognizing nausea as a symptom helps individuals understand the potential severity of foodborne illnesses and the importance of seeking medical attention when necessary.

The other responses do not relate to common symptoms associated with foodborne illnesses. Weight gain and improved digestion are generally not symptoms of foodborne illness but rather are often associated with food intake and metabolism. Increased energy is contrary to what a person experiencing a foodborne illness would feel, as symptoms typically involve fatigue and discomfort.