There has been a lot of debate about the health problems of overnight water and overnight dishes, and anything stained with the word "overnight" seems to become terrible. But it is said that "saving is the traditional virtue of the Chinese nation", and facing the leftovers at home really makes many people feel difficult.
Overnight water, overnight dishes, can you eat it?
01
Overnight water, overnight dishes,
Eating toxic or carcinogenic?
It is rumored on the Internet that overnight water cannot be drunk because there is nitrite in it, which will cause cancer after consumption?
In fact, nitrite itself is not carcinogenic, and all our diets, including water, meat, vegetables, fruits, etc., inevitably contain nitrates and nitrites, but as long as they are within the scope of national food safety standards, there are no health risks.
The state stipulates that the nitrite standard content of drinking water is 1mg/L, which is safe below this range.
The nitric acid content of overnight hookah increased from 0.0034 mg/L to 0.012 mg/L after 24 hours of placement. The nitrite content of 1,000 boiling water that was repeatedly burned 20 times was 0.038mg/L.
Therefore, whether the water can be drunk has little to do with whether it is overnight, mainly depends on the time of water placement and the preservation environment. There is no fixed time for the "deterioration" of water, because water will be affected by external temperature and humidity, high temperature and humidity in summer, bacteria multiply faster, it is easier to pollute water, causing human diarrhea.
Therefore, it is best not to drink overnight water in summer, and overnight water in winter is best packed in a container with a lid such as a warm water bottle, but it should not be left for too long.
Some people say that overnight tea has high nitrite content and is easy to cause cancer.
However, according to the experimental testing of Beijing Institute of Nutrient Source, whether it is Pu'er tea, chrysanthemum tea, or Longjing, after 12 hours and 24 hours, the nitrite content is within a safe range and will not cause cancer.
The reason why overnight tea changes color is because the tea polyphenols in it are oxidized, coupled with the increase of tannic acid after long-term storage, the taste is worse, but it will not harm health.
According to the Chinese Journal of Preventive Medicine, the minimum toxic dose of oral nitrite in adults is about 300mg-500mg, and ingestion of 1-3g can lead to death.
What is this concept? Generally, overnight dishes (excluding pickled vegetables and processed meats) are stored in the refrigerator for 24 hours, and the nitrite content will not exceed 10mg/kg.
Therefore, the nitrite content in overnight dishes is still far from the poisoning dose, not so easy to cause acute poisoning, occasionally eating a little problem is not big, there is no need to "talk about overnight dish color change".
If you can do it, try not to have leftover vegetarian dishes and cold dishes. Vegetables themselves have more nitrates and are more likely to produce nitrite than meat; Cold dishes are more susceptible to bacterial contamination than hot dishes.
Vegetables are not recommended to be left for more than 24 hours, especially cold vegetables. Fortunately, vegetables are also relatively easy to eat, and the calories are not high, as long as they are not too greasy and not salty, eat all vegetables, and the pressure is not great. The meat dishes placed in the refrigerator can be stored for 1~2 days as long as they are thoroughly heated before eating.
Of course, this does not mean that all food is safe to eat overnight, the following 4 foods, eating overnight may hurt the liver and kidneys, damage the intestines!
02
Really can't eat overnight,
It's these 4 foods!
Compared to cooked white boiled eggs, many people prefer to eat half-cooked "loose eggs". However, this half-cooked egg is not completely sterilized and may contain a variety of pathogenic bacteria such as salmonella; After a long time, it is easier to breed bacteria, and it will harm the intestines after eating.
【Tips】If the egg is boiled for the first time and stored at low temperature and sealed, it is generally not a problem to eat overnight in this case.
According to the "Dietary Guidelines for Chinese Residents", adults should eat enough 300-500 grams of vegetables a day. But there is an old saying that goes: "It is better to have meat than to be vegetarian." "Vegetables like to absorb nitrates from the environment: leafy vegetables> root vegetables> onions, garlic> melons and fruits> legumes> nightshade fruits.
In other words, leafy vegetables are the most risky category of nitrite, among which spinach is a vegetable that is often mentioned to be easily enriched with nitrates.
The Hong Kong Food Safety Center found that even if spinach is refrigerated after cooking, the nitrite content in it will exceed the national standard after 16 hours, and it will be higher at room temperature, so it is best to eat spinach at one time and not leave it for too long.
Seafood such as crabs, fish, and shrimp are high-protein foods, and if you don't eat them that day and eat them overnight, they may produce protein degradants and easily damage liver and kidney function. In addition, shrimp, crab and other seafood products, their intestines may contain various bacteria and spoilage substances. If not cooked while fresh, it may spoil from the inside out!
Many people will stew a pot of fungus soup in the refrigerator and eat it several times. But this is actually very dangerous!
Whether it is indoor cultivated silver fungus or wild silver fungus and mushrooms, if it is left for a long time after cooking, it is easier to breed bacteria, and abdominal pain, diarrhea and other symptoms may occur after eating.
【Tips】Silver fungus soup is sealed and refrigerated in the refrigerator for 1-2 days, it is okay; But after 3 days, it is better not to drink it; And eat the leftover silver fungus in the bowl, if it is not stored refrigerated, it is best not to eat it the next day.
Source: CCTV goes home for dinner
Editor: Dai Lin
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