Cross-sectional studyindependent cross-checkabstract only checked I-WHT-03 standard review
Diet and reflux
Dietary intake and the risk of gastro-oesophageal reflux disease: a cross sectional study in volunteers.
Overview
El-Serag HB et al.. Gut 2005 · PMID 15591498 · DOI 10.1136/gut.2004.040337
More fibre linked to fewer reflux symptoms; more fat to more symptoms.
Does the study support the specific claim? Partly · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Diet and reflux
- How was the study done?
Cross-sectional
- How many people, animals or samples were studied?
371 volunteers
- What was actually found?
Fibre protective association
- What do the results mean in everyday life?
Weak hint
- What are the study's limitations?
Small
- What does it say about Elawady's specific claim?
Does not support glue mechanism
- Do the results apply to Germany and Europe?
Moderate
- What can explicitly not be concluded from this study?
Cause
Scientific in-depth review
1. Full reference
- Authors
- El-Serag HB et al.
- Journal
- Gut
- Year
- 2005
- Identifier
- PMID 15591498 DOI 10.1136/gut.2004.040337
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
None stated.
2. Research question
Dietary components and GORD symptoms/erosive oesophagitis
3. Study design and population
- Study design
- Cross-sectional study – Cross-sectional study with FFQ and optional endoscopy
- Population
Employees of Houston VAMC
- Country
USA
- Period
not stated
- Sample size
371 analysable (164 with endoscopy)
- Inclusion and exclusion criteria
Complete questionnaires
4. Methods and endpoints
- Exposure / intervention
Fat, fibre, other nutrients
- Comparator
Lower intakes
- Endpoints
GORD symptoms; erosive oesophagitis
- Statistical methods
Logistic regression adjusted for BMI, energy
5. Actual results
- Results
Higher fat/saturated fat/cholesterol associated with GORD symptoms (fat effect non-significant after BMI adjustment, present in BMI >25). Fibre intake remained inversely associated with GORD symptoms in adjusted models.
- Absolute risks
not applicable
- Authors' conclusion
High fat associated with GORD; high fibre with reduced risk.
6. Strengths
- Endoscopy subset
7. Weaknesses
- Small, cross-sectional
- Volunteers
8. Risk of bias
- Orienting tool
- ROBINS-E
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- high
9. Assessment of the statistical interpretation
10. Relevance to the specific claim
Only study found linking diet fibre with reflux; compatible with preferring higher-fibre foods but not with the glue mechanism.
11. Independent contrary findings
12. Transferability to Germany and Europe
Moderate.
13. Overall methodological judgement
Weak evidence.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | high |
| Precision of results | low |
| Directness | indirect |
| Reproducibility | unknown |
| Consistency with the overall evidence | unknown |
| Regional transferability | moderate |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Trials on bread type and reflux.
15. Linked fact checks
- Refined white flour turns into a sticky glue-like paste in the stomach, sticks to the stomach wall, impairs stomach contractions and thereby causes reflux and indigestion, whereas whole-grain flour does not stick and is digested easily. – Studies with mixed or unclear results
- Stopping all white-flour products for about 5-10 days (in one video: within seven days) resolves reflux so that acid-reducing medicines are no longer needed. – Studies with mixed or unclear results