Without proper storage, they can even become contaminated with Clostridium botulinum, a dangerous bacterium that can cause severe nerve damage or be fatal.

Similarly, soft-boiled eggs and seafood are high-risk foods that shouldn’t be kept overnight due to the potential for bacterial contamination and toxin buildup.

To avoid foodborne illness, always store leftovers below 4°C (39°F), use sealed containers, and avoid keeping them for more than 24 hours. Reheat only once, as repeated heating can reduce both safety and nutritional quality.

By following these guidelines, you can keep your leftovers both safe and nourishing.