Meta-analysisindependent cross-checkabstract only checked I-SOD-04 standard review
Fructose and liver fat: trials
Effect of fructose on markers of non-alcoholic fatty liver disease (NAFLD): a systematic review and meta-analysis of controlled feeding trials.
Overview
Chiu S et al.. Eur J Clin Nutr 2014 · PMID 24569542 · DOI 10.1038/ejcn.2014.8
Fructose raised liver fat only when it added large amounts of extra calories.
Does the study support the specific claim? Partly · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Does fructose affect NAFLD markers?
- How was the study done?
Systematic review and meta-analysis of controlled feeding trials.
- How many people, animals or samples were studied?
13 trials; 260 participants; Healthy participants
- What was actually found?
Isocaloric: no effect. Hypercaloric: IHCL SMD 0.45 (0.18-0.72); ALT +4.94 U/L (0.03-9.85).
- How large was the observed effect?
SMD 0.45 (hypercaloric only)
- What do the results mean in everyday life?
Excess calories matter more than fructose alone.
- What are the study's limitations?
Few, small, short, poor-quality trials
- What does it say about Elawady's specific claim?
Limits C-SOD-04.
- Do the results apply to Germany and Europe?
High.
- What can explicitly not be concluded from this study?
Effects of usual intake.
Scientific in-depth review
1. Full reference
- Authors
- Chiu S et al.
- Journal
- Eur J Clin Nutr
- Year
- 2014
- Identifier
- PMID 24569542 DOI 10.1038/ejcn.2014.8
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
Not stated in abstract (lead group has disclosed industry links elsewhere; not verified here)
2. Research question
Does fructose affect NAFLD markers?
3. Study design and population
- Study design
- Meta-analysis – Systematic review and meta-analysis of controlled feeding trials.
- Population
Healthy participants
- Country
Multinational
- Period
Literature to Sept 2013
- Sample size
13 trials; 260 participants
- Inclusion and exclusion criteria
>=7 days follow-up
4. Methods and endpoints
- Exposure / intervention
Fructose isocaloric or hypercaloric (+104-220 g/day)
- Comparator
Other carbohydrates / no excess
- Endpoints
Intrahepatocellular lipids, ALT
- Statistical methods
Random effects
5. Actual results
- Results
Isocaloric: no effect. Hypercaloric: IHCL SMD 0.45 (0.18-0.72); ALT +4.94 U/L (0.03-9.85).
- Absolute risks
not applicable
- Authors' conclusion
Isocaloric fructose does not induce NAFLD changes; excess energy at extreme doses does, possibly due to energy.
6. Strengths
- Controlled trials only
7. Weaknesses
- Few, small, short, poor-quality trials
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Low-quality primary trials.
9. Assessment of the statistical interpretation
Small samples.
10. Relevance to the specific claim
Limits C-SOD-04.
11. Independent contrary findings
None.
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
Shows dose/energy dependence.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | low |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Longer trials.