Evidence map›Paper›PMID 26894909›Full record

Observational studyObesity surgery2016

The Effects of Bariatric Procedures on Bowel Habit.

Sorena Afshar, Seamus B Kelly, Keith Seymour, Sean Woodcock, Anke-Dorothee Werner, John C Mathers

Registry-linked trialAbstract readObservational Study
In one paragraph

Observational study in Obesity surgery, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07643376 (Evaluation of Postoperative Metabolic Parameters, Intestinal Permeability and Gastrointestinal Symptoms in Body Weight Management After Laparoscopic Sleeve Gastrectomy), which is not on this map. Cited by 26 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT07643376 not yet recruitingnot on this mapstarted 2026, after this paper: background citation

Evaluation of Postoperative Metabolic Parameters, Intestinal Permeability and Gastrointestinal Symptoms in Body Weight Management After Laparoscopic Sleeve Gastrectomy

TypeobservationalSponsorToros UniversityRan2026 to 2027Enrolled40ConditionsObesity, Morbid, Bariatric Surgery, Intestinal Permeability, Gastrointestinal SymptomsArmsClinical and Biochemical Assessment
3 · Its place in the literature

Who cites it

26 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
  3. Article
  4. Article
  5. Abdominal Pain After Bariatric Surgery and the Role of the Gut: A Review.Diabetes therapy : research, treatment and education of diabetes and related disorders · 2026
    Review
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  9. Article
  10. Observational
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  15. Article
  16. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Sorena AfsharNorthumbria Healthcare NHS Foundation Trust, North Shields, Tyne and Wear, UK. s.afshar@doctors.org.uk.ORCID 0000-0002-4676-8117
Seamus B KellyNorthumbria Healthcare NHS Foundation Trust, North Shields, Tyne and Wear, UK.
Keith SeymourNorthumbria Healthcare NHS Foundation Trust, North Shields, Tyne and Wear, UK.
Sean WoodcockNorthumbria Healthcare NHS Foundation Trust, North Shields, Tyne and Wear, UK.
Anke-Dorothee WernerNewcastle University, Newcastle-upon-Tyne, Tyne and Wear, UK.
John C MathersNewcastle University, Newcastle-upon-Tyne, Tyne and Wear, UK.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundBariatric procedures are increasingly being used to combat the rising obesity epidemic. The aim of this study was to assess the effect of these interventions on bowel habit.

methodsWe recruited obese adults listed for a bariatric procedure. Demographic data, medical history, medications and anthropometric measurements were recorded. Bowel habit was characterized using a 7-day Bristol Stool Form Scale (BSFS) diary. A validated food frequency questionnaire (FFQ) was used to assess diet.

resultsTwenty-six patients were assessed pre-operatively and at a median of 6.4 months post-operatively. Nineteen had a Roux-en-Y gastric bypass (RYGB), five had a sleeve gastrectomy (SG) and two had an intra-gastric balloon (IGB) with median percentage excess weight loss (% EWL) of 67.9, 52.4 and 31.3 %, respectively. Dietary fibre intake decreased from 24.4 (±12.1) g/day pre-operatively to 17.5 (±7.3) g/day post-operatively (P = 0.008). Frequency of bowel motions decreased from 8.6 (±3.5) to 5.7 (±3.5) motions/week (P = 0.001). Mean usual BSFS score decreased (towards firmer stool) from 4.1 (±1.3) pre-operatively to 3.1 (±1.9) post-operatively (P = 0.016). Constipation increased from 8 to 27 %, but this did not reach statistical significance (P = 0.125).

conclusionsConstipation is a common problem after bariatric surgery. The decrease in bowel motion frequency and change towards firmer stools suggest prolonged intestinal transit time after bariatric procedures. Reduction in dietary fibre intake is likely to be a contributory factor.

Indexed as

AdolescentAdultAgedBariatric SurgeryConstipationDefecationDietary FiberFemaleHumansMaleMiddle AgedObesityYoung AdultDietary FiberBariatric surgeryBowel habitBristol stool formGut transit

Identifiers

PMID26894909
PMCPMC5018031

What OpenQuestion holds

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Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.