Many of us buy ready-made food for home or cook so that the dish arrives in a few days. We store the leftovers in the refrigerator, but heating them can cause us health problems . For example, some are better to heat briefly, and for others it is not recommended at all, especially in a microwave oven. 


Decreased nutritional value and bacterial contamination are some of the things that can happen to us if we do not follow a few basic rules when preparing and storing products. 


Here are five foods we should never reheat:

1. Eggs

It is best to prepare and consume the eggs on the day itself, without staying extra. If we decide to heat scrambled eggs or another dish with them, we run the risk of becoming infected with bacteria that are activated between 40 and 140 degrees. Therefore, nutritionists warn that boiled eggs prepared for different holidays should not stay at room temperature for a long time, nor should they be heated further. 


The US Food and Drug Administration recommends that we eat boiled eggs no later than 4 days after cooking, and only if they are stored in the refrigerator. They can stay out of it for no more than two hours. 


2. Oil


Another food that we should never overheat is butter. Sometimes we use it to fry some foods and keep the rest in the pan for the next cooking. This is absolutely forbidden. The reason is that reheating the oil destabilizes its structure. If the temperature is too high, a toxic substance accumulates, which raises the levels of bad cholesterol in the body. This in turn causes an increased risk of heart disease and stroke, among other diseases. 


If we are at a restaurant and we are served something fried, which has sticky, dark and frothy leftover butter, it is better to return the order. 


3. Rice


Heated over and over again, rice can also cause a variety of health problems. This is due to bacteria that can multiply if it is not stored properly or stays too long after cooking, even in the refrigerator. Rice contains spores of bacteria that can sometimes survive even when cooked. Under suitable conditions, when we leave the rice at room temperature, they begin to multiply. By swallowing them, we can get intestinal problems. 


If we have rice left over from lunch or dinner, we can put it in the fridge, but it should stay there for no more than a day. 


4. Chicken


Chicken meat can contain from Escherichia coli to salmonella , which cause diarrhea, nausea and vomiting. Sometimes we can take the frozen meat out of the freezer and let it thaw. If we forget it and it stays longer before making soup, for example, the next day it will sour. 


Chicken, like all other types of meat, must be cooked at least 165 degrees. Once cooked, the meat should be cooled, but also stored in the refrigerator within two hours after cooking, if not eaten. It can be warmed for about 2 minutes, but not more. After cooking, the leftovers should be eaten within two days at the latest. 



5. Spinach, beets and celery


Spinach and green leafy vegetables in general are healthy foods through which we can get valuable vitamins and minerals . But we must not forget that they are also high-nitrate products. Under the influence of heat when heated and bacteria, these nitrates are converted into nitrites, which is associated with a risk of cancer, a new study shows. The same applies to beets and celery. 


After cooking spinach, for example, we can store it in a refrigerator at 4 ° C for up to 12 hours. 


The fresher the food we eat, the more we will be protected from harmful bacteria and digestive disorders.