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> Some researchers now believe that many if not most of the benefits come from all of the microbial action prior to consumption. That seems counter to the whol
by elcritch 3y ago
> Some researchers now believe that many if not most of the benefits come from all of the microbial action prior to consumption.
That seems counter to the whole idea behind modern research on the importance of the gut microbiome and a throwback to the thinking of the previous century.
Certainly some of the work of bacteria is done before but that’s well known as many foods are fermented but the cultures are killed or pasteurized afterwards. Classic American yoghurt was like this, but there’s clear benefits to yoghurt with live cultures. Even if many bacteria don’t colonize the gut their presence in the food or taken separately appears important.
In my opinion the evidence is overwhelming that actual probiotic bacteria themselves are important, not just their by products in the food. Our immune system detects healthy bacteria both living and dead and lowers inflammation in response, etc. There’s a lot of research on the topic and good summary research (1, 2). The presence of the bacteria also change the gene regulation in the intestines.
Fecal transplants can directly treat diseases, or trigger diseases with maladaptive bacteria (3).
1: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8512487/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8512487/
2: https://www.sciencedirect.com/science/article/pii/S2772502222001457 https://www.sciencedirect.com/science/article/pii/S277250222...
3: https://www.frontiersin.org/articles/10.3389/fimmu.2022.991788/full https://www.frontiersin.org/articles/10.3389/fimmu.2022.9917...
- slothtrop 3y agoYeah but fecal transplant bacteria isn't comprised of the sort of transient bacteria generally found in probiotic sources. It leads to a kind of hard-reset for gut flora. There are few sources that offer bacteria that will persist in the gut, I think I read kefir is one of them, but to what extent I'm not certain.
- elcritch 3y agoEven transient probiotics provide benefits too. Even when killed by stomach acid they trigger certain beneficial pathways. Many, perhaps most, traditional diets from around the world featured some live-culture fermented dish as a staple. Likely our bodies evolved to expect large daily exposure to certain healthy bacteria, and societies that ate live cultures with those bacteria would have better health.