If rice is part of your meal preparation routine, or if you are still left with leftovers, you will want to follow these food safety guidelines to avoid getting sick. Eating heated rice can cause food poisoning if you are not careful after cooking rice for the first time, advises the UK National Health Service.
Again, the problem is not warming the rice itself, but the way you handle it in the first place. After cooking the rice, you should not let it sit for more than an hour. Uncooked rice may contain spores of Bacillus cereus, a bacterium that can cause food poisoning. A bacterium can survive even after cooking rice, and the longer the rice stays at room temperature, the more bacteria can grow and produce toxins. If they are formed and you eat the rice later, you may end up with uncomfortable vomiting or diarrhea.