Post Date December, 02 2023
An immunologist in the United States wrote a new book, "Why Dirtis Good", which explains the saying that "unclean, no disease after eating"; The Daily Mail of Britain also put forward a "hygiene hypothesis", which said that if people pursue cleanliness too much, it may be harmful to health.
In fact, it is not unreasonable to "be unclean, eat without illness". The key is the "degree".
First barrier
We are always in a world full of pathogenic microorganisms. They are always "calculating" how to invade the human body. But our bodies also have layers of protective barriers. Among them, the complete skin and mucosa is the first barrier that can "keep most pathogens out of the door".
Second barrier
In addition, there is a more powerful specific immune system in the body that can target different bacteria and viruses. However, antibodies need to be stimulated by specific bacteria and viruses before they can be produced. If you have never encountered this kind of bacteria, you will not have the corresponding resistance.
Therefore, if you are accidentally attacked by a small amount of pathogenic bacteria in your daily life, the human body will develop immunity against this pathogenic bacteria and maintain it for a long time while eliminating the pathogenic bacteria. This is the basic principle of "not clean, not sick after eating".
The dirty "five second principle"?
There has also been a rumor among the people that if the food falls to the ground, it can be eaten if it is picked up within 5 seconds, and should not be eaten if it exceeds the time limit. So, is there any scientific basis for this statement?
In fact, the "five second rule" spread among the people is not accurate.
For example, when exposed to the sun, the rate of bacterial reproduction is slow, and the number of bacteria in contact with food falling on the ground is small; In a dark and humid environment, bacteria multiply rapidly, and more bacteria come into contact with food falling on the ground. Moreover, the lower the cleanliness of the ground, the more bacteria transferred to the food. The amount of bacteria is also related to the contact area between the food and the ground after landing. It doesn't matter if the food is caught when it doesn't touch the ground. As soon as the food touches the ground, the bacteria will immediately transfer to the food.
Nutrition experts also said that once the food falls to the ground, the bacteria will transfer instantaneously. For the sake of health, it is best not to eat it.
Although there is a certain reason for "being unclean and not ill after eating", the extremes of things must be reversed. The pathogenic bacteria of invasion should not be too many, and the virulence should not be too strong. Otherwise, it will be self-defeating and turn from a "joint military exercise" into a real "war of large-scale aggression". Therefore, everything should have a "degree". It is not good not to pay attention to sanitation, nor is it good to pay too much attention to sanitation.
