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LIT-903: From gut microbiota to host appetite: gut microbiota-derived metabolites as key regulators

1 min read

Properties5
StatusActive — read in full 2026-10-11 (NOTE-706) from the open-access text in Europe PMC (PMC8293578, CC BY). Worth reading as a map of the mechanisms by which gut microbes are proposed to reach host appetite (SCFAs, bile acids, tryptophan and indoles, bacterial protein mimics of host peptides such as ClpB for α-MSH), and for its own admission that the field "is mainly based on in vitro studies and rodent models". The human evidence it cites is correlational, or comes from prebiotic and metabolite interventions that do not isolate microbes as the cause.
Tagsnatural-sciences, ecology, motivation
SupportsCLAIM-166 — A lower-level collective within the composite person, such as the gut microbiome, can at times drive higher-level behaviour and even experience: the routes exist and the effects are causal in rodents, while the human evidence is modest
ReportsCASE-047 — Gut microbes and the host's hunger and mood: a lower-level collective that can drive the person
Cited as “paper” byNOTE-706 — Han et al. — From gut microbiota to host appetite

Graph View

Hui Han et al. (2021), Microbiome 9: 162 — doi:10.1186/s40168-021-01093-y

Key takeaways

Read in full; see NOTE-706.

  • Mechanisms are many and mostly rodent. SCFAs, bile acids, indoles and bacterial proteins act on gut hormones (GLP-1, PYY, ghrelin, leptin) and on the hypothalamus.
  • Bacteria make look-alikes of host appetite peptides. “ClpB, the best studied bacterial protein, can act as a mimetic of alpha-melanocyte- stimulating hormone (α-MSH) to result in similar anorexigenic effects”.
  • The human evidence is thin, by the authors’ own statement. “To date, our understanding of the gut microbiota roles in modulating appetite is mainly based on in vitro studies and rodent models.”

Standing in the record

Filed on 2026-10-11 as evidence for the owner’s example, in CLAIM-166 and CASE-047, that the gut microbiome can influence hunger. natural-sciences comes first, for host–microbe physiology. ecology is for the host–microbe partnership, and motivation for appetite. Not held in the anthology.

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