Properly preserved poached eggs can be eaten overnight, while improperly preserved and spoiled poached eggs cannot be eaten overnight. Boiled eggs are protein-rich foods, if kept at room temperature for more than four hours, they may deteriorate, leading to E. coli, Aureobasidium and other pathogens exceeding the standard, which may cause acute bacterial food poisoning, abdominal pain, diarrhea, nausea, vomiting, fever and other symptoms after consumption. Therefore, it is not recommended to consume boiled eggs after overnight if they are not properly preserved. If they are stored properly in the refrigerator after consumption, they can be consumed overnight and reheated well before consumption, and are generally not harmful to health. Nonetheless, it is recommended to prepare meals according to needs and consume fresh food as much as possible to ensure nutrient supply while minimizing food safety risks.