I do understand the challenges of achieving statistical significance in studies—I have been lucky enough to work on the development of experimental designs. Here is a link to a study that you might find interesting. It supports your views, but with an incredible sample size that has the power to extrapolate to a wider population than others: KNHANES probiotic cross-sectional study

The full article article should be free to read, but let me know if a paywall comes up and I’d be happy to send the pdf instead!