That's a hypothesis. If we knew that for certain, it would be really big news; and we could investigate to learn why, and then we could isolate the causative factors and perhaps find other ways of deploying them… If you know something the rest of us don't, prove it: show us the evidence, show us the specific hypotheses, describe a repeatable experiment, show us the results if such an experiment has been performed.

If you don't know something the rest of us don't, don't be so arrogant about your pet theories. Such arrogance costs lives.

You do realize they already are investigating, right? Even looking into MS and parkinson. ALZHEIMER’S DISEASE (AD) and AD DEMENTIA Umbrella review (systematic reviews of SRs): https://www.nature.com/articles/s44400-025-00048-6

Systematic review + meta-analysis (basal microbiota; AD): https://alz-journals.onlinelibrary.wiley.com/doi/abs/10.1002... https://pmc.ncbi.nlm.nih.gov/articles/PMC11672027/

Replicated case-control + functional metagenomics (AD dementia): https://alz-journals.onlinelibrary.wiley.com/doi/full/10.100...

Large-cohort metagenomics (stage-specific / early pathology signals): https://pubmed.ncbi.nlm.nih.gov/40164697

Mendelian randomization (AD): https://pubmed.ncbi.nlm.nih.gov/38788075/ https://www.sciencedirect.com/science/article/pii/S227458072... https://pubmed.ncbi.nlm.nih.gov/40665707/ https://journals.sagepub.com/doi/10.1177/25424823261422629 https://www.medrxiv.org/content/10.1101/2025.08.20.25333769v...

Narrative / mechanisms (useful synthesis, not primary causal proof): https://www.sciencedirect.com/science/article/abs/pii/S15681...

MILD COGNITIVE IMPAIRMENT (MCI) / DEMENTIA (cognition-focused evidence) Systematic review (MCI or Alzheimer’s dementia; PRISMA, PROSPERO): https://www.mdpi.com/2035-8377/17/10/155 https://pubmed.ncbi.nlm.nih.gov/41149776/

Scoping review (MCI and AD gut microbiomes + interventions, through Feb 2023): https://pmc.ncbi.nlm.nih.gov/articles/PMC12825029/

Systematic review of microbiota-targeted interventions for cognition/dementia risk: https://www.sciencedirect.com/science/article/pii/S027153172...

RCT-focused systematic review/meta-analysis of probiotics for cognitive impairment risk/AD/MCI: https://pmc.ncbi.nlm.nih.gov/articles/PMC12645680/

FMT in dementia/MCI context (review of effects across neuro cohorts): https://www.sciencedirect.com/science/article/pii/S266635462...

MULTIPLE SCLEROSIS (MS) Microbiome signatures via global data integration / ML: https://pmc.ncbi.nlm.nih.gov/articles/PMC12383397/

Systematic review/meta-analysis of probiotics in MS (preclinical + clinical): https://journals.plos.org/plosone/article?id=10.1371/journal...

Systematic review + meta-analysis (antimicrobial exposure and MS risk; microbiome-disruption relevant): https://www.sciencedirect.com/science/article/abs/pii/S22110...

Mendelian randomization (gut microbiota causally linked to MS): https://pubmed.ncbi.nlm.nih.gov/39065244/ https://www.mdpi.com/2076-2607/12/7/1476

Broad MS gut dysbiosis and therapeutic modulation review: https://pmc.ncbi.nlm.nih.gov/articles/PMC12668904/

MS gut-brain-barrier and intestinal barrier review: https://www.frontiersin.org/journals/immunology/articles/10....

Example MS cohort biomarker/signature work: https://www.nature.com/articles/s41598-024-64369-x https://www.nature.com/articles/s41598-025-19998-1

PARKINSON’S DISEASE (PD) Multi-cohort metagenomic meta-analysis (Nat Commun, 2025): https://www.nature.com/articles/s41467-025-56829-3 https://pubmed.ncbi.nlm.nih.gov/40335465/

Large metagenomics cohort (Nat Commun, 2022): https://www.nature.com/articles/s41467-022-34667-x

Integrated multi-cohort gut metagenome (Movement Disorders, 2023): https://pubmed.ncbi.nlm.nih.gov/36691982/ https://movementdisorders.onlinelibrary.wiley.com/doi/10.100...

Metagenomic analysis (Movement Disorders, 2024): https://pubmed.ncbi.nlm.nih.gov/39192744/

PD causal-inference and MR discussion (review-type synthesis): https://pmc.ncbi.nlm.nih.gov/articles/PMC12512240/

MR study example (PD gut microbiota): https://journals.lww.com/md-journal/fulltext/2025/10310/caus...

> You do realize they already are investigating, right?

Yes. I also realise they have not reached the conclusion of this investigation. (Imagine this attitude towards a police investigation: "They're investigating Roger Rabbit, therefore he must have dunnit!")