5 Foods That Become Harmful When Reheated — Forcing Yourself to Eat Them Only Brings Illness

Some foods should not be left over and reheated. Doing so not only reduces their nutritional value but can also generate harmful substances.

In daily meals, it’s common to have some leftovers. Most people store them in the fridge and reheat them for the next meal. However, not all leftovers are safe to reheat. Some dishes, once cooked, stored, and reheated, lose their nutrients and may even produce toxic compounds. Below are 5 types of food you should avoid reheating.

1. Mushrooms

Mushrooms are rich in protein and enzymes, which break down when reheated. They may also produce harmful compounds that cause digestive issues. Eating reheated mushrooms can lead to bloating, stomach pain, and diarrhea due to denatured proteins that are no longer safe.

2. Seafood

Seafood contains high amounts of protein and is prone to bacterial contamination during storage. When reheated, not only do nutrients deteriorate, but toxins from bacteria can also trigger digestive disorders.
Cooked seafood that has been stored too long or reheated loses its freshness and significantly increases the risk of food poisoning.

3. Leafy Green Vegetables

Leafy greens are often rich in nitrates. When reheated, nitrates can convert into nitrites, which in turn can transform into nitrosamines—compounds linked to health risks, including the growth of cancerous cells.
For vegetables, it’s best to cook only what you need for one meal and eat them fresh.

4. Soft-Boiled Eggs

Eggs may contain Salmonella bacteria, which can cause diarrhea and food poisoning. In soft-boiled eggs, these bacteria may not be completely destroyed, posing an infection risk. Reheating does not guarantee that salmonella will be eliminated. Therefore, soft-boiled eggs should be eaten immediately after cooking and not stored or reheated.

5. Snow Fungus (White Jelly Mushroom) Soup

Snow fungus is often used in beauty-boosting dishes, but it contains high levels of nitrate. Once cooked, nitrates can convert into nitrites. High nitrite intake can be harmful, leading to digestive disorders and negatively affecting normal blood formation.
To maximize its nutritional benefits, snow fungus should be cooked and consumed immediately rather than stored and reheated.

Final Advice

Instead of saving leftovers and reheating them, it’s better to prepare just enough food for one meal. This way, your dishes are always fresh, full of nutrients, and delicious in flavor.