Uncooked rice can contain Bacillus cereus, a sneaky little bacteria that loves to party in starchy foods. When you cook the rice, you kill the active bacteria, but their heat-resistant spores can survive.
If you leave your cooked rice sitting on the counter for hours—like, more than two—those spores wake up and start multiplying. They release toxins that can make you feel like you’ve been hit by a truck.
But here’s the kicker: reheating the rice won’t kill those toxins. So the damage is already done if you’ve left it out too long. It’s like trying to un-bake a cookie—once the bad stuff is there, it’s there.
