Reheating leftovers from last night saves us a lot of time cooking and preparing meals. However, not all foods are safe to be reheated, so next time when you are in the kitchen, about to microwave some of that leftovers from the other night, remember NOT TO REHEAT THESE FOODS BELOW:
Bacillus cereus is a highly resistant bacteria present in rice, and reheating/microwaving rice may kill this bacteria but will also produce toxic spores that can cause diarrhea, vomiting and nausea. When left in room temperature, the spores in cooked rice will multiply and may produce poisons. The best way to cook rice is to heat it to boiling and then keep it warm above 140°F.
It’s best to cook potatoes on a baking sheet instead of wrapping them in aluminum foil because a rare bacteria called Botulism can still survive when potatoes are not thoroughly cooked. To prevent the growth of this bacteria, immediately refrigerate cooked potatoes after eating and not let them cool down in room temperature. This will help avoid any problems with reheating potatoes later.
Reheating eggs may not be a good idea for your digestive system. The main problem with reheating eggs is that, more often than not, they are not microwaved long enough. If eggs are eaten at temperatures lower than 74°C, they can upset your stomach and even cause food poisoning. “Cooked eggs and egg dishes may be refrigerated for serving later but should be thoroughly reheated to 165° F before serving,” according to FDA. So your best bet is to use a frying pan instead of a microwave when it comes to reheating that omelette from morning’s breakfast.
I am guilty of reheating my home-cooked marinara spaghetti with mushroom. Again, the problem with reheating mushrooms is the bacteria they develop between being cooked and reheated. If not refrigerated immediately after cooking, their complex enzyme and protein structure can be destroyed, which can in turn cause upset stomachs when reheated. However, if properly refrigerated and not for longer than 24 hours, then it is often no problem to reheat mushrooms again at recommended temperatures of 158°F (or 70°C).