24/09/2026
Firstly...Fermented foods are awesome! I eat them all the time. But theyโre not necessarily doing what a lot of folks still think. Thereโs a floating narrative that eating fermented foods means youโre โcolonisingโ your gut with beneficial bacteria and that fermented foods can essentially do the same job as a probiotic.โฃ
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The reality is more nuanced.โฃ..
Fermented foods can contain a diverse range of microorganisms, but these microbes are generally ๐ญ๐ซ๐๐ง๐ฌ๐ข๐๐ง๐ญ ๐ซ๐๐ญ๐ก๐๐ซ ๐ญ๐ก๐๐ง ๐ฉ๐๐ซ๐ฆ๐๐ง๐๐ง๐ญ ๐ซ๐๐ฌ๐ข๐๐๐ง๐ญ๐ฌ ๐จ๐ ๐ญ๐ก๐ ๐ ๐ฎ๐ญ. The species and strains can also vary considerably depending on the food, fermentation process, environment and manufacturer.โฃ
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That doesnโt make fermented foods useless. In fact, regularly exposing the gut to a broader range of microorganisms helps build back poor microbial diversity and stimulate immune pathways. โฃ
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But microbial exposure isnโt the same thing as permanently changing the ecosystem - for those with dysbiosis and depleted commensal families i.e. ๐๐ข๐๐ข๐๐จ๐๐๐๐ญ๐๐ซ๐ข๐ฎ๐ฆ, ๐๐ค๐ค๐๐ซ๐ฆ๐๐ง๐ฌ๐ข๐, ๐
๐๐๐๐๐ฅ๐ข๐๐๐๐ญ๐๐ซ๐ข๐ฎ๐ฆ and so on. โฃ
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A probiotic generally contains specific, characterised strains at a defined dose, whereas the microbial composition of fermented foods is way less predictable. โฃ
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Rather than continually introducing new microorganisms, ๐ฉ๐ซ๐๐๐ข๐จ๐ญ๐ข๐ ๐๐ข๐๐ซ๐๐ฌ provide substrates that existing members of your gut microbiome can utilise to โgrow backโ. โฃ
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So I think itโs more useful to think about them as three different tools:โฃ
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๐ฅฌ Fermented foods โ microbial exposure & dietary diversityโฃ
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๐ Probiotics โ specific strains at defined doses for desired medicinal action ๐ช.๐ฆ. ๐ด๐ต๐ฐ๐ฑ ๐ฅ๐ช๐ข๐ณ๐ณ๐ฉ๐ฐ๐ฆ๐ข, ๐ช๐ฎ๐ฑ๐ณ๐ฐ๐ท๐ฆ ๐ฎ๐ฐ๐ฐ๐ฅ, ๐ช๐ฎ๐ฑ๐ณ๐ฐ๐ท๐ฆ ๐ฎ๐ฐ๐ต๐ช๐ญ๐ช๐ต๐บ ๐ฆ๐ต๐ค.โฃ
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๐ฑ Prebiotic fibres โ substrates that fuel the growth of beneficial bacteria only to re-nurture them back into decent ranges.โฃ
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None of these automatically โfixesโ the microbiome.โฃ
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And whether fermented foods, probiotics or particular prebiotic fibres are useful really depends on the individual gut ecosystem, symptoms, diet and clinical context.โฃ
Catchya next time! ๐
