Prevention: antibiotic stewardship and the environment

Holding on to your recovery depends on prevention. In this chapter you will learn the most important preventive tools — from conscious antibiotic use through environmental hygiene to lifestyle — so that you can keep the chance of relapse low for years to come.

Antibiotic stewardship: your most important line of defence

If there is a single thing to remember about prevention, it is this: the antibiotic is the greatest disruptor of your gut flora^[G], and it is precisely this that opens the way for C. difficile to return. Antibiotics do not discriminate — while they destroy the targeted bacterium, they also decimate the useful, protective flora, and the emptied "space" can easily be taken over by the pathogen. This does not mean you must never take an antibiotic again; there are situations where it is life-saving. The key is awareness: only when it is truly justified, and always in such a way that your treating physician knows your CDI history.

In practice this means a few simple rules. Never take an antibiotic on your own initiative or from leftovers; always ask whether it is genuinely needed, and whether there is a narrower-spectrum or safer alternative. If another doctor (for example a dentist or emergency care) prescribes an antibiotic, always mention that you have had recurrent C. difficile infection — this information can influence the choice. This kind of conscious antibiotic use is the backbone of prevention.

And there is an important connection to the course of treatment as well: if in future you do need an antibiotic and would meanwhile start a DiffBiome course, the antibiotic must always be finished before the live flora is delivered, with an appropriate interval — otherwise the antibiotic would also destroy the freshly delivered bacteria. Always discuss this with your doctor.

The antibiotic is not the only medication that affects your flora. From time to time it is worth reviewing your chronically taken medications with your doctor as well. Among acid suppressants, proton pump inhibitors (PPIs) — which many people take for years, often unnecessarily by now — reduce the protective acidity of the stomach and raise the risk of CDI. You should not stop them arbitrarily, but it is worth asking the question: "is this still necessary?". It is similarly worth reviewing agents that slow gut motility (anticholinergic, opioid-type drugs), because the pathogen multiplies more easily in a sluggish gut. The point is not self-diagnosis, but a regular, joint medication review with your doctor — every unnecessary drug that can be dropped is one more layer of protection for your flora.

The environment and lifestyle: the quiet safety net

Alongside antibiotic stewardship, environmental hygiene is the second pillar of prevention. C. difficile spreads through resistant spores, which the usual hand sanitiser does not always destroy reliably — so frequent, thorough handwashing with soap and water is the most effective protection, especially after using the toilet and before eating. In the household, regular cleaning of frequently touched surfaces (toilet, door handles, taps) also reduces the presence of spores. This is not excessive worry, but a simple, quiet safety net in everyday life.

Environmental hygiene also has a broader meaning, beyond strict spore control — this is called the exposome, that is, the many thousands of environmental influences to which you are exposed day after day, and which subtly shape your microbiome. A few simple points of awareness belong here. Drinking water: aim for clean water from a reliable source; adequate fluid is the foundation of recovery, but the quality of the water matters too. Household disinfectants and antibacterial products: targeted cleaning against CDI spores is justified, but everyday, unjustified use of disinfectants — antibacterial soaps, sprays on every surface — also kills off the useful microbes of your own body and your environment, so here too moderation is the right path: where soapy water is enough, do not disinfect. Finally, healthcare exposure: hospital and clinic environments are one of the main sources of CDI — if you are admitted to an institution, feel free to ask for hand hygiene, to mention your previous infection, and to avoid unnecessary antibiotics.

Few people think of it, but the mouth is a microbiome too — and through the so-called oral–gut axis it is connected to your digestive system. Regular tooth brushing, the use of dental floss and dental check-ups protect not only your teeth but also reduce the burden of oral pathogens, which can spread to the gut. This is a small, easily sustainable habit that supports your whole microbiome health.

The next pillar is lifestyle, which keeps your flora so diverse and resilient that the pathogen has nowhere to re-establish itself. These are the same few habits you built during recovery: a varied, fibre-rich diet, enough sleep, regular exercise and stress management. Together they strengthen colonisation resistance^[G] — that is, your flora's ability to crowd out the pathogen on its own. Here continuity is the goal: it is worth keeping these habits not just until the end of the programme, but beyond it.

Finally, prevention also means knowing your own early signs, and not being ashamed to ask for help in time. If symptoms were ever to reappear, the vigilance you learned earlier — attention measured against your logged baseline — and prompt medical contact are the most effective. Prevention is therefore not a single rule, but an attitude: the awareness with which you protect the balance you worked for over ninety days.

🍽️ Eating during these days

On the eating side, the theme of prevention means keeping the gut flora so diverse and resilient that the pathogen has nowhere to re-establish itself. Alongside antibiotic awareness and hygiene, a varied, fibre-rich diet is the third, quiet pillar of prevention — it is what sustains colonisation resistance over the long term. The concrete eating task for the three days is in harmony with the daily tasks: keep up conscious fluid replacement, choose 2–3 dietary habits to carry on lastingly, and each day include the plant of the day in at least one meal.

For these days (76–78), the Plant Calendar (Appendix F) brings the sources chicory / chicory coffee (76), black garlic (77) and prunes (78). Chicory is one of the richest natural sources of inulin — a strongly fermentable prebiotic fibre from which the useful gut bacteria make short-chain fatty acids, including butyrate; black garlic is fermented and rich in polyphenols, and prunes support regularity once the stool is already stable. In the second half of the programme (roughly days 61–90), the goal is precisely to sustain full diversity and inulin-rich, fermentable sources: a diverse, well-fed flora is more resilient, and this resilience is the biological basis of prevention. Inulin sources can be more gas-forming; introduce them according to your tolerance, and prunes only if your stool is stable.

References

[159] Chassaing B, Koren O, Goodrich JK et al. Dietary emulsifiers impact the mouse gut microbiota promoting colitis and metabolic syndrome. Nature. 2015. Link

In wild-type mice, relatively low concentrations of two ubiquitous emulsifiers — carboxymethylcellulose (CMC) and polysorbate-80 (P80) — induced low-grade inflammation and obesity/metabolic syndrome, and promoted robust colitis in mice predisposed to it. The mucus-protective barrier and microbiota composition were disrupted. The findings implicate dietary emulsifiers, ubiquitous components of processed foods, in the post-mid-20th-century rise in inflammatory bowel disease and metabolic disorders.

[160] Chassaing B, Van de Wiele T, De Bodt J, Marzorati M, Gewirtz AT. Dietary emulsifiers directly alter human microbiota composition and gene expression ex vivo potentiating intestinal inflammation. Gut. 2017. Link

Using the M-SHIME ex vivo human microbiota model that excludes host inflammation as a confounder, both carboxymethylcellulose (CMC) and polysorbate 80 (P80) acted directly on the human microbiota to increase its pro-inflammatory potential, evidenced by elevated bioactive flagellin. The CMC-induced flagellin rise was rapid (1 day) and driven by altered microbial gene expression. The findings establish that these dietary emulsifiers exert direct, host-independent pro-inflammatory effects on the human gut microbiota.

[365] Reed AD, Theriot CM. Contribution of Inhibitory Metabolites and Competition for Nutrients to Colonization Resistance against Clostridioides difficile by Commensal Clostridium. Microorganisms. 2021. Link

This review examines how commensal Clostridium species mediate colonization resistance against C. difficile. Commensal Clostridia modify primary bile acids into secondary bile acids that suppress C. difficile spore germination and vegetative outgrowth. They additionally produce antimicrobial peptides and short-chain fatty acids that directly inhibit C. difficile and compete for limiting nutrients such as proline, important for C. difficile growth via Stickland fermentation. Loss of commensal Clostridia after broad-spectrum antibiotics is a key mechanistic step toward CDI susceptibility. The authors argue that restoring defined Clostridium consortia is a rational, mechanism-driven alternative to FMT for preventing recurrent CDI.