You should avoid these four food leftovers at all costs

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Jan , 28. 12. 2025

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Each of us loves it when we don’t have to cook new food every time, but simply reheat and eat food from the previous day. Reheating itself is not harmful.

However, there are foods you should never reheat. Otherwise you could endanger your health.

Foods can be divided into those that can be reheated multiple times and those that you should never reheat repeatedly.

Consuming some leftovers can seriously harm your health. So make sure you avoid reheating the following four foods.

Vegetables
Incorrect storage of vegetables or reheating them is not only dangerous but can even be fatal.

According to the Food Safety Center, even vegetable leftovers should always be stored at a temperature of 4 ° C. And if you plan to store them for a longer period, it’s better to freeze them.

Spinach, beetroot, head lettuce and celery contain high amounts of nitrates, which can accumulate if the vegetables are exposed to room temperature. This then causes various problems.

According to a study, nitrogen oxide can induce methemoglobinemia in children. It is a rare blood disorder that causes symptoms such as seizures, shortness of breath and fatigue.

Vegetable oils
Reheating food prepared in vegetable oil is very dangerous and is associated with an increased risk of heart disease, stroke and cancer.

According to recent studies, reheating polyunsaturated fats that contain linoleic acid (sunflower oil, corn and canola oil) releases 4-hydroxynonenal.

It is a toxin derived from fatty acids and can seriously damage your health.

This toxic compound is associated with heart disease, liver problems, Alzheimer’s disease, Huntington’s disease and some types of cancer.

Vegetable oils are intended for single use and under no circumstances should you reheat them back to the boiling point.

Chicken
Chicken contains high amounts of protein. If you reheat it a second time, its composition changes and it becomes dangerous for humans.

Reheating chicken is only acceptable in exceptional cases. In addition, when reheating you must ensure the meat is heated evenly and to a high temperature.

This rule is especially important if you use a microwave oven, which sometimes does not heat meat evenly.

Using a microwave oven itself is problematic, because many studies point to undesirable changes in the structure of heated foods.

You should also know that you can consume chicken for only 2 days from the first cooking and never more than that.

Rice
Rice should be stored properly if you want to stay healthy.

The Food Standards Agency states that raw rice contains harmful bacteria and heat-resistant spores.

If you store rice at room temperature, these bacteria can begin to multiply and cause you various digestive problems.

Pathogenic bacteria often even survive reheating, which is why experts recommend eating all types of rice immediately after the first cooking.

If you have leftover rice, do not put it in the fridge; rather freeze it.