Leftovers of your favorite meal can often be useful if you’re looking to pack something for lunch the next day or need some inspiration for another dish. While reheating your leftovers may seem harmless, it can be quite dangerous, so here are five foods you should think twice about before reheating. Whether you cooked it yourself or it was in your favorite Chinese takeout dish, reheating rice can be harmful as it contains bacteria called Bacillus cereus, which can cause food poisoning. Reheating a baked potato can cause deadly illness, as the foil that the potato is wrapped in creates a low-oxygen environment, a perfect breeding ground for Clostridium botulinum. Clostridium botulinum, or botulism, has a fatality rate of 5-10%, with one teaspoon of the toxin capable of killing around 100,000 people. Reheating cooking oil that you’ve used the day before can harm brain health, with a study linking the reuse of deep-fried oil with liver inflammation, high cholesterol and colon damage. One of the most common foodborne illnesses is salmonella, so if you plan on reheating your chicken, make sure it reaches its original temperature of 165 degrees Fahrenheit. Putting hard-boiled eggs in the microwave will cause the shells on the eggs to explode, so it is advised to reheat them using boiling water.