But is it true?
The original source of this statement is the results of a study published in the well-known international journal “Pediatrics” by Bill Hesselmar, an assistant professor at the University of Gothenburg in Sweden: Compared with traditional manual dishwashing, those families who use dishwashers of children are more likely to have asthma, eczema or seasonal allergies. Among them, 23% of children in families who washed dishes by hand had eczema and 1.7% had asthma; but children in families who used dishwashers had 38% eczema and 7.3% had asthma.
Known as the “hygiene hypothesis,” these findings suggest an association, not causation, so it remains unclear whether dishwasher use is directly responsible for the increased incidence of allergies in children.
Hygiene hypothesis is a medical hypothesis that refers to the lack of exposure to infectious agents, commensal microorganisms (such as gastrointestinal flora, probiotics) and parasites in childhood, which inhibits the normal development of the immune system and increases the risk of allergic diseases. possibility.
But which microbes are beneficial to our immune system and which are harmful, as of now, there is still no clear answer. Children in areas with poor sanitation do have lower rates of allergies than those in areas with better sanitation. But if you sample the blood of children infected with parasites, you will find that each of the “allergy” indicators in their blood is particularly high. If you only look at the report, you will definitely mistakenly think that the blood sample tested comes from a patient with severe allergies.
On the other hand, the hygiene hypothesis itself is also flawed. For example, in areas with poor sanitation, the incidence of infectious diseases is high, but the incidence of allergies is not reduced. Moreover, studies have found that early exposure to certain respiratory viruses, such as daily cross-infections in child care centers, does not reduce children’s allergies, but increases the chances of asthma.
With the advancement of sanitation, today’s children are free from many deadly infections, which is a great blessing. The “sanitation hypothesis” gives the false impression that these efforts to improve sanitation are wrong, but the reality is otherwise. Microbial irritation is just one of thousands of allergies, and infection with deadly microbes can lead to serious illness or death. Compared with allergies, the relative importance is obvious.
On the other hand, what a family should do is to move the environmental sanitation balance slightly towards the middle to maintain hygiene, but don’t make the home and the sterile room, and disinfect everything with alcohol and high temperature, which is too much.
In addition, dishwashers do have a specific condition that can be harmful to health. For detailed reasons, please refer to the analysis of the ingredients of dishwashing powder and whether it is harmful for long-term use.