Two fiber types went head to head on human bile acid profiles

Fan J et al. published a human comparison of two fiber types, resistant starch and polydextrose, on plasma and faecal bile acid profiles with microbiota associations, in the European Journal of Nutrition on July 23, 2026 (PMID 42489745).

The digest could not retrieve the abstract before PubMed access closed during the run, so no findings, effect sizes or design details are summarized here. The topic is directly relevant to how different fiber types shape bile acid metabolism and the microbiome.

The numbers

Fiber types compared

2 (resistant starch, polydextrose)

What this does not show

Any result at all. The abstract could not be retrieved before PubMed locked the digest run out. Only the citation and topic are known.
The study design. Whether this was a randomized feeding trial, its duration, doses and participant numbers are all unconfirmed.
That either fiber is better. No comparison outcome has been read, so no ranking of resistant starch against polydextrose can be stated.

Caveats worth holding

The abstract was not retrieved during the digest run, so nothing beyond the citation and topic is verified.
Design, doses, duration and sample size are all unknown pending retrieval of the paper.