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Randomized trial · measured other health measures

Trial in people with constipation, plus mice: one B. longum strain improved symptoms

Zhang and colleagues · Cell host & microbe · 2023

Original title: A key genetic factor governing arabinan utilization in the gut microbiome alleviates constipation.

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What the study found

Points to benefit

In the human trial, the B. longum strain with the abfA cluster, but not the strain without it, increased helpful gut metabolites and improved constipation symptoms. Mouse results were similar. No numbers in abstract.

The study at a glance

Type of study
Randomized trial
Who or what was studied
Mice with constipation, plus people with long-term constipation in a trial
What was tested
Bifidobacterium longum with the abfA gene cluster vs a strain without it, vs placebo
What it measured
Several kinds of outcomes
Trial registration
ChiCTR2000034415, ChiCTR2100041925, PRJNA906498, PRJNA906271
Who has a stake
No stake declared
No competing interests declared.
Journal
Cell host & microbe, 2023
Source
PubMed record 37992712. This page is based on the abstract only.

How much this study counts

  • ✓Randomized: people were put into groups by chance, so the groups start out alike.
  • ✓Compared with a placebo, a dummy treatment.
  • •The abstract does not say how many people took part.
  • •Measured several kinds of outcomes.
  • ✓No competing interests declared.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: gut symptoms such as bloating and IBS

    9

    5 benefit, 2 mixed, 2 no difference

  2. Trials in people: other measures

    10

    4 benefit, 2 mixed, 4 no difference

    ↑ This study is the ringed dot

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    0

    None among the papers we read.

  5. Blood levels and genes

    0

    None among the papers we read.

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Do probiotics improve gut health?”

Some strains may help some symptoms.

Confidence: low. Based on 28 on-topic papers.

Read the full answer

Of the other 9 papers on the same step: 3 benefit, 2 mixed, 4 no difference. This one found benefit.

  • Quoted in “What we found”: Effects are strain-specific: one B. longum strain eased constipation while a version lacking the abfA genes did not, so results for one product do not carry over.
  • Marked as a key paper in the research timeline: Gene cluster explains why one strain works.

Other papers on the same step

See all 28 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The two reads differed. The reviewer checked the abstract and kept the first read. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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