Meta-analysisindependent cross-checkabstract checked★ key study I-FRU-103 standard review
Fruit juice and weight
Consumption of 100% Fruit Juice and Body Weight in Children and Adults: A Systematic Review and Meta-Analysis.
Overview
Nguyen M et al.. JAMA Pediatr 2024 · PMID 38227336 · DOI 10.1001/jamapediatrics.2023.6124
Each extra daily glass of 100% juice was linked to slightly more BMI gain in children.
Does the study support the specific claim? No · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Pool data on juice and weight.
- How was the study done?
Meta-analysis.
- How many people, animals or samples were studied?
42 studies.
- What was actually found?
Children gain more BMI.
- How large was the observed effect?
+0.03 BMI per serving/day.
- What do the results mean in everyday life?
Limit juice for children; whole fruit is better.
- What are the study's limitations?
Observational in children.
- What does it say about Elawady's specific claim?
Contradicts free juice use.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
It does not prove causation.
Scientific in-depth review
1. Full reference
- Authors
- Nguyen M et al.
- Journal
- JAMA Pediatr
- Year
- 2024
- Identifier
- PMID 38227336 DOI 10.1001/jamapediatrics.2023.6124 · PMC10792499
- Verification
- verified – PubMed efetch 2026-10-26 + Crossref works API
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
Some authors report funding linked to the Canadian Sugar Institute and prior employment at a contract research organisation (declared); NIH/CIHR support.
2. Research question
Is 100% fruit juice consumption associated with body weight in children and adults?
3. Study design and population
- Study design
- Meta-analysis – Systematic review and meta-analysis of prospective cohorts and RCTs
- Population
45,851 children (17 cohorts); 268,095 adults (6 cohorts, 19 RCTs)
- Country
International
- Period
Searches to 18 May 2023
- Sample size
42 studies
- Inclusion and exclusion criteria
Cohorts >=6 months, RCTs >=2 weeks; juice vs noncaloric control in trials.
4. Methods and endpoints
- Exposure / intervention
100% fruit juice
- Comparator
Lower intake / noncaloric control
- Endpoints
BMI change (children), body weight (adults)
- Statistical methods
Random-effects pooling; meta-regression
5. Actual results
- Results
Children: +0.03 BMI (95% CI 0.01-0.05) per additional daily serving. Adults: cohorts unadjusted for energy +0.21 kg (0.15-0.27), energy-adjusted -0.08 kg (-0.11 to -0.05); RCTs -0.53 kg (-1.55 to 0.48).
- Absolute risks
Not applicable
- Authors' conclusion
One daily serving of 100% juice was associated with BMI gain in children; findings support limiting juice.
6. Strengths
- Large child cohort data
- Separate child/adult analyses
7. Weaknesses
- No RCTs in children
- Small effect sizes
- Abstract only
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
Observational child data.
9. Assessment of the statistical interpretation
Small per-child effect; energy mediation in adults.
10. Relevance to the specific claim
Contradicts free juice use, particularly for children (C-FRU-03 safety).
11. Independent contrary findings
Adult RCTs null.
12. Transferability to Germany and Europe
Applicable.
13. Overall methodological judgement
Supports guideline advice to limit juice for children.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | moderate |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Trials in children.
15. Linked fact checks
- Fruit juices, including canned juices and nectars, are allowed or preferred (mango only as juice; on one third-party site fresh juices are forbidden and only canned juices allowed). – Studies contradicting or limiting the claim
- Implicit in the system's lists: sugar-cane juice, canned juices, honey, jam and sweets are acceptable while sugar-sweetened soft drinks are harmful. – Studies contradicting or limiting the claim