Eli5: If there are billions of bacteria in our body, why is it bad for someone to just pop some anti biotics even without being sick

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Antibiotics kill bacteria. There are billions of bacteria in our body. Why is it drug abuse if I just decide to toss in a few in my mouth, without being sick, since there would always be bacteria to kill

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The vast majority of bacteria within your body are beneficial/symbiotic. Humans evolved in tandem with these bacteria. To the point where – your appendix – previously seen as without purpose, has now been understood to be a *repository for good bacterial colonies* – so that your body can replenish your intestines with that good bacteria if the rest needs to be essentially purged (due to food poisoning, etc).

Much of your mood is dependent on strains of bacteria, which interact with serotonin receptors in your gut and regulate stimulation of the vagus nerve, and much of your **immune system’s** effectiveness – tied to proper bacterial colonies.

If you were to purge your body of bacteria, everything about your health would end up screwed up.

So, no – you don’t want to just casually take antibiotics. Yes, sometimes bad bacteria will present in your body in the form of an infection – but of the trillions of bacteria in your body, the majority are there in a helpful/medically-necessary capacity. Many of them are there also fighting off bad bacteria.

Hope this clarifies. I could grab citations, but honestly – if you’re doubting anything I’ve said here – a quick Google search will prove every part extensively.

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