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Posted on 30th January 2019
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This article on Business Insider, describes the health risks of eating your own boogers (in British English, bogies).
This topic is especially relevant for people like me, who live in Germany, which is the nose-picking capital of the world.
Unsurprisingly, picking your nose is unhealthy; eating your boogers is even more so. Some of the rarer described health problems are rather nasty.
One of the things which the author seems to be unaware of is oral tolerance. This is a mechanism, which probably evolved to prevent us from having allergic reactions to our food, whereby the body identifies things in the mouth as non-threatening. Eating your boogers, which are filled with viruses and bacteria, therefore means that you are likely to have a reduced immune response to these same viruses and bacteria in other parts of your body. In other words, eating your boogers will likely mean that you will be sicker, and for longer, than if you didn't eat them.
The article mentions that there are some people who claim that eating your boogers strengthens your immune response, and that there is no proof of this effect. The truth of the matter is, due to oral tolerance, exactly the opposite.