The next day you will just warm it up and it is ready to eat, not aware what might happen to you. Here’s why you should not do that.
We all, too often, prepare food for a few days and then just reheat it. However, some dishes change their composition and lose their nutritional properties, and even become poisonous. The following ones are the cases:
Mushrooms are best when eaten immediately after preparation, and if they stay for a day, it is better to eat them cold. This is important for soups, as well as for risotto, which is made with mushrooms. When heated, mushrooms come to change in the composition of proteins, or even change the flavor. They can then cause different digestive problems and lose the health benefits.
Just like mushrooms, when you heat meat, there comes a change in the composition of proteins. So it is not advisable to heat the meat at high temperatures, especially the chicken meat, which contains more proteins than the red meat. If you heat it up, it is better to put it at a lower temperature and heat it for a longer time.
The potato is a very nutritious food that should not be heated for the second time since it loses most of its properties, and even becomes toxic. Eat the potatoes immediately after preparation or even cold- then, there is a highest percentage of resistant starch, credited for lingering the feeling of satiety. If you prepare a soup for a few days, add the potatoes consistently.
Spinach is a food with a high percentage of nitrates, which get converted to nitrites when re-heated. They are potentially carcinogenic to the human body, so make sure to eat spinach either fresh or immediately after preparation.
Like spinach, beets also contain nitrates which become extremely harmful after re-heating. This does not mean that you cannot eat the food the next day, just you should not heat it again.
Celery, which is commonly used for soups, should immediately be removed after cooking, together with carrots, and should be consumed freshly prepared. It also contains nitrates. You can heat the soup again if you have removed celery and carrots.
Eggs are high risk foods for re- heating, which also become toxic after exposure to high temperatures. This does not apply to foods where eggs are included in sauces, like Bechamel, but refers to dishes of cooked and fried eggs.