Never reheat these 7 foods! Warning! They can poison a person when reheated

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Tomáš , 28. 12. 2025

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Many of us are used to reheating food and eating it multiple times. Some foods stay the same after reheating, but there are foods that harm our bodies when reheated. Some people consider these foods to be hazardous to health.

Reheating food

Some foods lose their nutritional value after reheating. We’ll reveal which 7 foods this phenomenon affects and you should not consume these foods reheated.

Spinach

Reheating spinach is truly dangerous to health, and you should never do it. It is recommended to eat it immediately after cooking. Why? Spinach contains a high proportion of nitrates, which are transformed into nitrites when heated. This means that after reheating, spinach becomes carcinogenic.

Celery

Celery is used mainly in soup preparation. It contains nitrates like spinach, so when heated these nitrates are transformed into nitrites. When reheating soup it’s better to remove the celery from it and the carrot as well.

Beetroot

It’s good that this vegetable contains nitrates, but after reheating it becomes quite dangerous. You should never reheat it because it becomes very harmful when reheated.

Potatoes

Potatoes have many beneficial properties, which make them very useful, but if you leave them to sit and cool for a day or two, they can lose these properties as well as their nutritional value. After that they can be very dangerous to the body and no longer beneficial.

Eggs

Eggs can be deadly dangerous if you expose them to high temperatures and reheat them. If eggs are added during preparation, then they are not dangerous. This refers only to reheating fried and boiled eggs.

Chicken

If you eat chicken the day after preparation, it is particularly dangerous. You may also cause certain digestive problems because the structure of the proteins changes the next day. This is a big problem because chicken contains more protein than red meat. It is recommended to eat chicken cold. But if you have to reheat it, then heat it for a long time at a low temperature.

Mushrooms

Mushrooms are the riskiest food to reheat. It is recommended to eat them immediately after preparation. If you eat them the next day, eat them cold. Reheated mushrooms can cause certain digestive problems and sometimes even heart problems.

You should be careful about which leftover foods you reheat in the oven or microwave. Make sure the food you want to reheat does not contain any of the products listed above. If you are considering reheating these foods, bear in mind how dangerous they can be for you afterwards.