Cooked rice is a staple in millions of households around the world. It’s affordable, filling, easy to prepare, and incredibly versatile. Because of its simplicity, many people assume rice is one of the safest foods to store and reheat. However, food safety experts warn that leftover rice can become surprisingly dangerous if it is not handled correctly.
This risk is so well documented that it even has a name: “fried rice syndrome.” Despite the name, this illness is not limited to fried rice—it can occur with any cooked rice that is stored improperly.
What Is “Fried Rice Syndrome”?
“Fried rice syndrome” refers to food poisoning caused by Bacillus cereus, a bacterium commonly found in soil and dust. This bacterium can contaminate raw rice before it is ever cooked. While cooking kills many harmful microorganisms, Bacillus cereus produces spores that can survive high temperatures.
Once rice is cooked, these spores can become active again under the right conditions—especially when rice is left at room temperature for too long. As the bacteria multiply, they release toxins, some of which are resistant to heat and cannot be destroyed by reheating.
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