5 cooked foods that can turn risky by the next day

Beyond bacterial risk, repeated reheating and prolonged storage can also degrade the nutritional quality and texture of many dishes — a secondary but real reason to think carefully before keeping certain foods overnight.

2 hours

The maximum time food safety experts allow between cooking and refrigerating cooked food to limit bacterial growth.

Mushrooms, leafy greens and the bacteria they attract

Cooked mushrooms are particularly susceptible to bacterial growth because they are rich in both moisture and nutrients — two conditions that favour microbial multiplication. They should be refrigerated as soon as possible after cooking and eaten within a short period. Reheating alone does not reliably eliminate every harmful microorganism they may harbour.

Bowl of cooked leafy greens and mushrooms on a kitchen counter — Illustration © Toptenplay

Cooked leafy vegetables — spinach, lettuce and similar greens — lose freshness quickly and can also become a breeding ground for bacteria if stored improperly. There is an additional concern specific to this category: nitrate-rich vegetables may undergo chemical changes during storage that reduce their nutritional value.

The practical advice for both is the same: prepare only what you plan to eat, refrigerate promptly, and avoid leaving cooked greens at room temperature for any significant length of time.

Rice and seafood: the two highest-risk foods to keep overnight

Cooked rice carries a specific and well-documented hazard. It may contain spores of Bacillus cereus, a bacterium whose spores can survive the cooking process. If rice is left at room temperature for several hours before being refrigerated, those spores can multiply and produce toxins that subsequent reheating cannot destroy.

Cooked white rice and shrimp on a kitchen worktop — Illustration © Toptenplay

To reduce the risk, food safety guidance calls for refrigerating rice within two hours of cooking, storing it in airtight containers, and reheating it thoroughly only once before serving.

Seafood — fish, shrimp, oysters and shellfish — spoils faster than almost any other cooked food. Even under refrigeration, bacteria continue to grow slowly. Any seafood that develops an unpleasant odour, a slimy texture, or an unusual appearance should be thrown away without hesitation.

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