Foodborne Illness · what actually hurts people in the kitchen

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Food poisoning is acute and usually improves within a few days; see a doctor for diarrhea lasting more than 3 days, bloody stools, a fever above 38.9°C, persistent vomiting, or dehydration. Long-term, recurring abdominal pain and diarrhea are a different problem, and treating them as one more bad meal misses the tests you actually need.

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Three routes to getting sick

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The same meal can floor you by two opposite mechanisms: sometimes live bacteria get into the gut and keep multiplying; sometimes the bacteria died long ago and only the toxin they left in the food remains. That is why cooking a dish thoroughly sometimes cannot save you.

In the infection route, you swallow live bacteria. They multiply generation after generation on the gut wall, and you fall ill only once there are enough of them, often hours to days later; Salmonella, Vibrio parahaemolyticus and Campylobacter take this route. Heat kills live bacteria. In the intoxication route, you swallow a toxin that is already made — staphylococcal enterotoxin and bongkrekic acid belong here — and symptoms often start within half an hour to a few hours; processing temperatures can kill the bacteria but do not remove toxin that has already formed (Regenthal 2017; Han 2023). A third route sits between the two: the bacteria start making toxin only once they are in your gut, and Clostridium perfringens loves a big pot of food that was cooked and then left warm to cool slowly.

A few cases can kill: after eating wood ear mushrooms soaked for a long time at room temperature or wet rice noodles kept too long, any symptom at all — or blurred vision, trouble swallowing, or weak arms and legs — means seek medical care immediately; a child or older person vomiting and with diarrhea who cannot keep fluids down and is passing little urine should not wait at home either.

Educational content, not medical advice — consult a clinician.

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