The reason why it's bad to pick your nose and eat it is because your boogers contain bacteria and viruses which are harmful and can potentially make you sick and spread germs to other people as well.
Boogers in your nose trap in germs, pollen and viruses from the environment and eating those boogers that contain the germs, pollen and viruses can expose your body to those pathogens and make you sick.
Boogers can also contain germs and bacteria and viruses that your body can be trying to get rid of and by eating them you're getting those viruses, bacteria and germs back into your body.
In rare cases picking your nose excessively can even damage your nasal septum and picking your nose can also cause nosebleeds when you tear a delicate blood vessel in your nose.
The nasal septum is what divides your left and right nostril.
Although nose picking does not always cause any health problems but it is possible and is not a good habit.
Your body naturally produces mucus in order to trap in harmful substances including germs, bacteria and viruses and keep the tissue underneath it from drying out.
Your body also digests and also absorbs mucus, so when you swallow mucus it is not bad for you but eating boogers is not a good or healthy habit.
Nose picking is very common as most people including kids and adults and teens and people of all ages pick their nose.
Picking your nose is a very widespread habit.
In reality 100 percent of people probably do pick their nose at some point in their life even though they may not admit it.
At least 91 to 95 percent of people report that they pick their nose.
While anyone of any age does pick their nose the nose picking is more common in children.
Picking your nose is a natural habit and children that have not yet learned social norms also realize that early on the fit between their finger and their nostril is pretty good.
Picking your nose too much can cause damage to the inside of your nose and spread infections and even cause nosebleeds.
Your fingernails can scratch the inside of your nose and can break blood vessels.
Chronic nose picking can also damage your nose cartilage that separates your nostrils and can potentially cause a hole.