# SIBO After Antibiotics: Why the Environment, Not the Bacteria, Is the Problem

> How do you tell if you have SIBO? Learn why low stomach acid, poor bile flow, slow motility and gut lining damage cause overgrowth, and why it keeps coming back.

- Source: https://gutfix.ai/blog/how-do-you-tell-if-you-have-sibo-5-2
- Author: Kieran, GutFix co-founder (https://gutfix.ai/about)
- Published: 2026-08-12
- Category: SIBO
- Reading time: 3 min

Small intestinal bacterial overgrowth refers to bacteria finding a nice cozy environment where they could replicate, not simply "bad bacteria" invading you. So many people misinterpreted this when really he was talking about small intestinal bacterial overgrowth.

## Key takeaways

- In which case he's right, you need to address why the overgrowth can happen in the first place though. Low stomach acid. Poor bile flow. Slow motility. Damaged gut lining.
- But roughly 60% of the time it comes back, and that's because the bacteria was never the problem, they just saw a nice cozy environment where they could replicate.
- Make that nice cozy space inhospitable again and gently encourage them out and they don't come back.

## What Did People Get Wrong About Bacteria and SIBO?

Funny that most people assume his stance was that all bacteria was bad,

So many people misinterpreted this when really he was talking about small intestinal bacterial overgrowth.

In which case he's right, you need to address why the overgrowth can happen in the first place though.

- Low stomach acid.
- Poor bile flow.
- Slow motility.
- Damaged gut lining.

Whereas the commonly cited remedy is just nuke with antibiotics, which don't get me wrong for some with SIBO helps.

But roughly 60% of the time it comes back, and that's because the bacteria was never the problem,

They just saw a nice cozy environment where they could replicate.

Make that nice cozy space inhospitable again and gently encourage them out and they don't come back.

## Is All Bacteria Really Bad?

all in all I don't believe his work should be referenced as "all bacteria bad, kill them all". of course overgrowths are bad, but also beneficial bacteria and in general a good gut environment is extremely important. look at histamine degraders, which peat considered a stress hormone no? without those a stress hormone is elevated,

Or look at bacteria/yeast that stimulate a healthy gut lining, which can break down LPS and bacterial toxins which was a big part of his framework no?

I realise now this sounds kind of pointed with the question marks, just to clarify I am asking for your opinion and anything you'd like to add

## What Is the Biggest Defence Against Endotoxin?

Interesting take, what I've seen personally differs on the note of hypothyroidism but it is a reality for a fair few people you are right,

I do personally think though that a stomach that produces adequate [stomach acid](https://gutfix.ai/blog/what-are-signs-of-poor-bile-flow) and bile that's good in quality and flows properly and a thick healthy mucus lining and gut lining Is the biggest defense against endotoxin there is.

I can't tell you to take or not take a medicine, but one thing I'll note is many of these things studied for IBD naturally are used as adjuncts to normal treatment and not just alone. do I think meds are the best thing or close to it? no. do I think they are these evil things that will keep you trapped? not really also. look into a few of these things check for any interactions check with your doctor and see how you can enhance their current treatment, or make a decision yourself whether it's the best for you. Happy to answer any questions on DM

@rtnnnie Interesting conversation, thank you

## Frequently asked questions

### Why does SIBO keep coming back after antibiotics?

But roughly 60% of the time it comes back, and that's because the bacteria was never the problem, they just saw a nice cozy environment where they could replicate.

### What actually causes small intestinal bacterial overgrowth?

Low stomach acid. Poor bile flow. Slow motility. Damaged gut lining.

### Is killing all bacteria the right approach to SIBO?

of course overgrowths are bad, but also beneficial bacteria and in general a good gut environment is extremely important.

### What is the biggest defence against endotoxin?

a stomach that produces adequate acid and bile that's good in quality and flows properly and a thick healthy mucus lining and gut lining Is the biggest defense against endotoxin there is.

### How do you stop SIBO recurring long term?

Make that nice cozy space inhospitable again and gently encourage them out and they don't come back.

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