White fungus is a high-level nutritional supplements, however, to do such a healthy food, there will also be some concern, overnight fungus and silver ear can not eat? Where overnight can not eat clouds, in addition to the fear of microbial reproduction, the reason for its contraindication is almost always from the increase in nitrite, which is a factor that increases the risk of stomach cancer. So silver ear and fungus overnight after which the nitrites will be excessive?

Is overnight white fungus really inedible?

Fall weather is dry, many people hear the advice of traditional Chinese medicine, have begun to boil silver ear soup, cooking more fungus, take their moisturizing effect. However, to do such a healthy food, there will be some concern - I have heard many times netizens ask the question: overnight fungus and silver ear can not be eaten?

One woman said she often likes to make white fungus soup for beauty purposes. However, it is impossible to make only one bowl at a time, necessarily three or four bowls of the amount, a day to eat, put in the refrigerator, or more worried. Some people who love to eat fungus also said, fungus a few dozen is not worth hair, once often more soak a little, each time you do a little bit of cooking, overnight is often the case. If the overnight can not eat, they are in the end what poison is produced? How harmful?

Where overnight can not eat clouds, in addition to the fear of microbial reproduction, the reason for its contraindication is almost always from the increase in nitrite. Mushrooms cannot utilize nitrates or nitrites, but they can partially utilize inorganic nitrogen sources such as urea and amines. That is, when raising mushrooms, the nutrients added inside the medium may include urea, which itself is non-toxic, but which the fungus may metabolize into nitrate. Nitrates themselves are also non-toxic. However, during foaming, cooking and storage, there is concern that some of the nitrates may be turned into nitrites by bacteria, and nitrites are a factor in increasing the risk of stomach cancer.

But don't start freaking out at the sound of nitrites, think logically about a few questions:

First, do fungus and silverbeet contain more nitrates? Does it increase after soaking?

Second, how much do nitrites actually increase if you leave them at room temperature and in the refrigerator for 24 hours each?

Third, how much are they consumed? Is the nitrite intake at a level that would cause danger?

In regard to the changes after 24 hours of storage, I have not found any measurement data on silverbeet, only one article on fungus. This article determined the content of fresh fungus after 24 hours of storage at room temperature and in the freezer, and found that the change was very small no matter what temperature it was stored at. The article also measured the effect of boiling on the nitrite content of fungus, which rose from 2.19 mg/kg to 2.59 mg/kg after 24 hours of storage at room temperature, a negligible change for human health. Although there is no data on silver fungus, but from the theoretical speculation, the pattern of change should be similar to the fungus.

The last question is, how much fungus or silver ear can people eat every day? The usual serving size is no more than 5 grams of dried product, which is equivalent to about 50 grams of fresh product. If silver fungus is used to make soup, the quantity is even less, with no more than one or two eaten per day. Even if some more, according to the fresh weight of 100 grams (about two bowls) to calculate the daily intake of nitrite content is not more than 0.3mg. And nitrite caused by human poisoning dose is more than 200mg, difference of several hundred times it. In contrast, people eat pickles, not fresh vegetables and pink meat dishes, ham, sausage, meat, sauce meat, etc., the number of nitrites will be higher than this amount of tens of times or even hundreds of times.

Therefore, the claim that eating overnight fungus and silver fungus can cause poisoning is purely an untrue rumor. At present, I have not seen reports of poisoning due to eating overnight fungus or fungus. Unless someone intentionally added nitrite or nitrate to the fungus illegally, there is such a possibility.

If you cook more silver fungus soup at one time, you can keep it for 1-2 days without worrying about it as long as you follow the advice in my previous blog post and store it in the refrigerator in small portions, taking out each portion once and heating it up to eat it. If you soak more fungus at one time, just put it in the fridge to avoid the flavor and smell, and you can still cook and eat it the next day.

Eating overnight white fungus can lead to nitrite poisoning?

Silver fungus has been treated as a tonic, which is rich in silver fungus polysaccharide (about 70% of the dry weight) is to prove the nutritional value of silver fungus, "killer", beauty, enhance immunity all rely on it. However, some preliminary research on polysaccharides in the silver fungus does not confirm the powerful "magical" effect of these polysaccharides, and a lot of in-depth research is still needed.

But the stewed fungus is so smooth and creamy that it's good for dessert or a late-night snack. The first thing you need to do is to make sure that you have the right amount of food to eat, and that you have the right amount of food to eat. The amount of stewing a few days at a time is much faster and more economical! What? "Never, never, never eat overnight ginkgo soup! The silver ear contains nitrates, overnight, nitrates will be broken down by bacteria into nitrites. Nitrites not only cause poisoning, but also increase the chance of stomach cancer!" And look at the recent milk poisoning incident, nitrites can kill people!

Where to nitrite

Nitrates and nitrites are not unique to psyllium, plant growth will use the natural nitrogen synthesis of amino acids, in the process will inevitably generate nitrate, and some of the reductase enzyme in the body of the plant will be part of the nitrate reduced to nitrite. Therefore, all plants contain nitrates and nitrites. And all of our daily diets inevitably contain nitrates and nitrites.

Nitrate itself is non-toxic, but it is reduced to nitrite, and if large amounts of it enter the body, it can lead to "methemoglobinemia". Nitrite will oxidize the divalent iron in hemoglobin to trivalent iron, so that hemoglobin loses the ability to carry oxygen, resulting in the body's lack of oxygen, which can lead to death in severe cases. As for carcinogenicity, it is the nitrite converted into nitrosamines. Nitrosamines are already recognized carcinogens.

Nitrites in overnight white fungus

Given that there is only relevant data in the literature on fungus, which is very close to the nutrient composition of silver fungus, it is also more reliable to take the data on fungus as a reference. The nitrate content of fresh fungus is 120 mg/kg, and the nitrite content is about 2.5 mg/kg, which are both far lower than the standards of the Food&AgricultureorganizationoftheUnitedNations(the nitrate content of first-class fresh vegetables is less than 432 mg/kg, and the pollution-free Vegetables nitrite content of less than 40 mg / kg). The vast majority of commercially available silver fungus for the dried products, fresh silver fungus made of dried products in the process, nitrate, nitrite loss, security is higher

Dried silver fungus in the consumption of pre-soaking, nitrate and nitrite is very soluble in water, by the water, after soaking, the silver fungus cells of the cell membrane will be broken, these trace amounts of nitrates, nitrites will be run into the water la. Therefore, it is best to use running water to rinse a few times before soaking in water for 1-2 hours.

The nitrate in the overnight fungus will not be reduced to nitrite by bacteria, making the nitrite content surge? As long as it is properly preserved (airtight refrigerator refrigeration), Shell Health is sure to tell you: no. Or to fungus as an example, room temperature, overnight boiled fungus in the nitrite content from 2.19 mg / kg to 2.59 mg / kg, which are far less than 200 mg of toxic dose (note that the unit is kg ah, kg!) . In theory, silverbeet is similar, and silverbeet itself does not contain nitrate-reducing bacteria. Also, it can be soaked in the refrigerator to reduce the harm.

Nitrite levels are already very low, and even less is converted to nitrosamines in the body. Cancer is a multifactorial result, not just nitrosamines. Even if you eat a bowl of ginkgo in the morning and evening, the amount of nitrite you eat into your body is not as much as a ham sausage! (Sodium nitrite is a common preservative used in the meat industry and is not harmful in legal amounts with current technology.)

Tips for buying white fungus

White fungus is not good for eating! Fresh silver fungus is naturally air-dried to a beige color, with the roots slightly darker. In order to extend the shelf life of the fungus air-drying process will often use sulfur fumigation, but this will make the fungus leaves folded, brittle taste, more worrying is the sulfite residue exceeding the standard problem. Sulfites excessive intake of human gastrointestinal, liver damage! So, choose the silver ear, not the whiter the better, silver ear originally is yellow skin ah!