Xu Yi wanted to laugh in his heart, it was not so easy to make her believe that this kind of homemade mask was really not beneficial, and this person was thinking about finding a straw to save his life. Shrugging his shoulders, he said, "It's really useless, and it's better not to use these things if you can't use them." These extras are not much different from a thin layer of sponge, just to prevent the moisture from drying out, and don't expect them to provide any nutrients to your skin. And things like eggs and milk are not only not good for the skin, but may also have a certain adverse effect on human health. ”

Liu Liping asked in surprise: "No, even if what you said is right, this will not improve the skin at most, where can there be any harm?"

Xu Yi sighed secretly in his heart, it seems that this person doesn't believe what he said, it's just that this kind of cognition for more than ten years completely contradicts what he said, and it is just a natural reaction. "You're wrong, let's take eggs as an example. Didn't we say before that chickens use guò cloaca to urinate, but in fact, this egg also comes out of the anus through guò cloaca......"

The fat man interjected with a wicked smile next to him: "Yes, a lot of eggs still have stuck to them." ”

"Dead fatty, you don't come to disgusting people!"

"Well, I'm not talking about that. Xu Yi shook his head at the fat man with a smile, and said: "These can be seen, in fact, there is no big problem, but if the egg-laying hen itself is infected with avian dysentery, it is easy to stain the surface of the egg with avian Salmonella, and then you paste the raw egg on your face, and if you accidentally make the egg white contaminated and contaminated with Salmonella." ”

Liu Liping turned white to Xu Yi. "It's very unlikely, it's not that coincidental. ”

Xu Yi said with a smile: "It's true that there aren't many opportunities. Especially for large-scale chicken farms, basically the vaccine and management can keep up. It's really unlikely that there will be such a thing, but if it's because of the super-drug-resistant Salmonella produced by the drug, it is likely that the infection will be more severe, just like Methicillin-resistant Staphylococcus aureus, and multidrug-resistant Salmonella has appeared in the United States, and it is only a matter of time before this situation occurs in China. As for the use of native eggs, it is even more difficult to say whether there is an infection with Salmonella or not. Of course, this alone is nothing, and this salmonella will not cause any effect on human skin. But it would take at least half an hour for you to make this mask, wouldn't it?"

"Yes. It will take at least half an hour. ”

"Have you ever thought about whether it is possible for such a long time and when you apply egg whites to your face that the egg whites stick to your lips or even eat them in your mouth? Of course, it's not possible to eat it on purpose, but you can't do nothing for so long, right?"

Liu Liping nodded. "Well, that's a possibility. ”

"Can you guarantee that it is not possible to get the salmonella in this egg white into the mouth? What do you think is the characteristic of digestive tract disease, and is this a typical mode of fecal-oral transmission?"

Liu Liping rolled her eyes at Xu Yi. protested: "Bastard third, you're disgusting. But what Xu Yi said was true, and it wasn't like the fat man was deliberately disgusting, so he didn't say much.

Xu Yi smiled: "Of course." Even eating raw egg whites doesn't necessarily infect you with avian paratyphoid fever. But if the bacillus enters the stomach and is not killed by gastric juice, but enters the small intestine to multiply, won't it lead to paratyphoid fever?"

"I guess you're thinking about switching to 'more nutritious', 'healthier' native eggs or you'll be fine, right?" Xu Yi guessed as he looked at Liu Liping's expression.

Liu Liping nodded. "Yes. But that's hard enough to buy. ”

Xu Yi said: "I'm afraid that the situation will be worse, except that there may be Salmonella contamination as before." There are other risks involved. ”

"Generally speaking, if you raise free-range chickens, you will get Newcastle disease at most, and the chickens will be loose before they want to feed some tetracycline or something. You must know that tetracycline is even taken by people. It can also penetrate the placental barrier, not to mention chickens, which may undoubtedly make this egg contain zài tetracycline, knowing that the dose of veterinary drugs is greater than that of humans. If you have a tetracycline allergy, it is possible that the skin that has been covered with a mask will produce exfoliative dermatitis if it is exposed to ultraviolet rays. ”

Liu Liping pursed her lips and said: "Your example is too extreme, then I can always use milk without eggs, this is all pasteurized, and it is unlikely that there will be pathogenic bacteria." ”

Xu Yi smiled and said: "It is very extreme, and using milk produced by regular manufacturers can indeed avoid these problems." But even if there is no zoonotic problem, even if it is washed out with milk powder, this mask is still not safe!"

"If you say it's not safe, it's not safe, so why do so many people do it?"

"Because you don't use your brains to do things. Xu Yi smiled, and then said: "It takes you an hour and a half to make a mask, think about it for such a long time, such a high protein content, and it is kept in a damp state and exposed to the natural environment, will this mask be contaminated by bacteria?" In the event that any bacteria can infect the skin, this nutrient-rich homemade mask has no preservatives, which provides the best medium for these bacteria, and the destruction of the oil film on the skin's surface, coupled with the high moisture content of the stratum corneum, is it possible for the pathogenic bacteria to break through the skin's defenses and cause infection?"

When the fat man heard this, he interjected again: "In the most disgusting way, this mask is made down, but I'm afraid that it will be as dirty as toilet water!"

"Dead fatty, my aunt and grandmother are not finished with you today!" As she spoke, Liu Liping angrily wanted to grab the pillow to beat Yu Hangsheng, but was stopped by Yan Peimin. "You let the third child finish talking and then trouble him. ”

Xu Yi smiled and said: "Do you think that milk is white, and your face can be white after making a mask, if you think like this, you should find paint to brush the wall and wipe it on your face." For you, this stuff doesn't just whiten your skin. It can also provide a better source of nitrogen for the P. acnes in your acne, don't you think it's a zài risk?"

Liu Liping said dejectedly: "Hmph." It's a big deal, I don't need to make my own ingredients, I'm going to buy a red wine mask, right?"

"Yo. Aren't you afraid of preservatives?" Xu Yi glanced at Liu Liping, asked jokingly, and then said, "I still know why I use red wine as a mask." ”

Liu Liping glanced at Xu Yi in surprise, when did this person pay attention to these things. So he asked him, "Tell me about it." ”

Xu Yi said: "I guess it's because both anthocyanins and resveratrol have a certain protective effect on cells, right?"

"At least that's what the red wine mask says, and you say that you have the leisure to study these things, you might as well find a girlfriend seriously. ”

Xu Yi said: "It's all graduated, you see that except for the two of you in our class, the rest of us are all Bifen." Or the next time there is a class reunion in a certain year, I don't know how many people will die and never get along, can you expect me to find a true love at this time?"

"It's not to please girls, so why are you thinking about these things?"

Xu Yi couldn't cry or laugh, and said: "You see that I've been talking about this for so long, and I'm annoyed by you, is this a way to please girls?

"When I'm willing to look at that. However, in the past few years, there have been a lot of practical research articles in professional journals about how resveratrol and anthocyanins are, and some of them are extracted directly from red wine, so I can naturally guess this. ”

"Ahh That means drinking red wine is really good for your health, and this red wine mask really works?"

Xu Yi shook his head: "Basically, it can only prove that these things have a protective effect on isolated cells, but basically there is no rigorous paper to prove what effect long-term drinking of red wine can really have on human health." ”

"But it's these practical papers. It is also hyped by wine practitioners, and the academic atmosphere in China has made some less rigorous research be promoted as if it were the truth. In fact, resveratrol is the same as anthocyanins. There is no complete research on dosage and metabolism in the body, and the most that can be proven by the current research results is that if you drink alcohol. Then choosing to drink red wine will have certain benefits compared to simply consuming alcohol. However, the act of drinking alcohol itself is a bad habit, and it does not equate to the benefits of drinking red wine. ”

"Unlike academic research, where truth is paramount, the beauty and health care industries, fearing that they will miss the opportunity, hype up these incomplete studies and deliberately ignore their potential harm to the human body – the most typical example of this is aloe vera. ”

Liu Liping asked, "Is there anything wrong with aloe vera?"

"Modern discoveries that aloe vera can not fight cancer, some real yàn confirmed that undecolorized aloe vera extract has a clear carcinogenicity to rats, and even the U.S. Food and Drug Administration cancelled the over-the-counter drug qualification of aloe vera drugs ten years ago, but is there such a cautious operation in China? Even aloe vera has recently been included in the ranks of new foods, it can be said that I am afraid that after a long time, long-term consumption of a large number of aloe vera products will lead to various problems. Xu Yi sighed lightly, and then said: "Let's go back to the red wine mask, the highest resveratrol content in a liter of red wine is less than two milligrams, how much red wine can a mask put on you? And this thing is extremely easy to oxidize in the air, let alone use a red wine mask, even if you wash your face with a bottle of red wine, such a little thing is exposed to the air, I am afraid that the skin can not absorb even a microgram." ”

"And since red wine is called wine, in addition to water, the highest content is actually alcohol, such a low concentration of alcohol, naturally do not need to consider its dehydration bactericidal effect, this mask naturally has to add additional preservatives, and as a small molecule of alcohols, alcohol is naturally very easy to penetrate into the skin. ”

"Alcohol ingested into the human body through the digestive tract will be inactivated in the liver and converted into acetaldehyde to enter the normal metabolic pathway, but there is no alcohol dehydrogenase or acetaldehyde dehydrogenase in skin cells, especially the dead cells of the stratum corneum. I'm afraid that even the already fragile cell membranes will be dissolved and destroyed by ethanol. At least theoretically, exposure to alcohol on the skin will undoubtedly make the stratum corneum cells loosen and easy to peel off, and it also makes it easier for external toxic and harmful substances to enter the body through incomplete epidermal tissue to produce an immune response. ”

"If the amount of alcohol is more and penetrates deeper into the hair growth layer, it may undoubtedly cause changes in the normal function of these human cells, and it is difficult to say how it will affect the function of the skin. ”

"So it's very difficult to evaluate the benefits and disadvantages of this red wine for the skin, and you need to discuss it carefully, and you also have to consider whether the resveratrol or anthocyanins are easy to penetrate the skin, and then whether normal skin cells can effectively use anthocyanins and resveratrol, and so ......on."

"It's obviously not something you and I can do to figure these things out. Before the scientific and systematic arguments, I personally thought that even if the supermarket promoted people to give you a red wine mask, the best place for this thing to go was your trash can, not your own face. The mask is free, this face is your own, throw it in the trash, the loss is not you, there is nothing to feel sorry for. (To be continued......)