FOOD-FSA-2024-005 food-safety health_risk ai_generated true

AI tells a user that reheating leftover rice in the microwave is safe if it is heated until steaming, ignoring the risk of Bacillus cereus spores surviving and causing food poisoning

ID: food-safety/reheated-rice-bacillus-cereus

Also available as: JSON · Markdown · 中文
94%Fix Rate
89%Confidence
1Evidence
2024-01-10First Seen

Root Cause

Bacillus cereus spores can survive cooking and germinate if rice is left at room temperature for too long; reheating may not destroy the heat-stable toxins produced by the bacteria, leading to vomiting or diarrhea.

generic

中文

蜡样芽孢杆菌孢子能在烹饪中存活，如果米饭在室温下放置过久会萌发；重新加热可能无法破坏细菌产生的耐热毒素，导致呕吐或腹泻。

Official Documentation

https://www.foodsafety.gov/food-safety-charts/safe-minimum-internal-temperatures

Workarounds

  1. 93% success Cool cooked rice within 1 hour by spreading it on a tray, then refrigerate within 2 hours of cooking. Reheat only once, and consume immediately. 
    Cool cooked rice within 1 hour by spreading it on a tray, then refrigerate within 2 hours of cooking. Reheat only once, and consume immediately.
  2. 95% success Freeze leftover rice in portion-sized bags; thaw and reheat thoroughly (steaming hot) within 24 hours. 
    Freeze leftover rice in portion-sized bags; thaw and reheat thoroughly (steaming hot) within 24 hours.

中文步骤

  1. 将煮熟的米饭在1小时内摊开冷却，然后在烹饪后2小时内冷藏。只重新加热一次，并立即食用。
  2. 将剩饭分份装入袋中冷冻；在24小时内解冻并彻底重新加热（至冒蒸汽）。

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Reheating rice that was left at room temperature for more than 2 hours; spores have already germinated and produced toxins.

  2. 85% fail

    Believing that steaming hot reheating kills all bacteria; toxins are heat-stable and survive reheating.

  3. 70% fail

    Storing rice in the fridge for several days and then reheating; toxin can still form if cooling was slow.