Systematic reviewindependent cross-checkabstract only checked I-CAN-07 standard review
High sugar intake is linked to many health problems, weakly to some cancers
Dietary sugar consumption and health: umbrella review.
Overview
Huang Y et al.. BMJ 2023 · PMID 37019448 · DOI 10.1136/bmj-2022-071609
Evidence for weight gain is moderate; links with cancers are mostly low quality.
Does the study support the specific claim? Unclear · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Review sugar-health evidence.
- How was the study done?
Umbrella review.
- How many people, animals or samples were studied?
73 meta-analyses.
- What was actually found?
Mostly harmful associations.
- How large was the observed effect?
Fructose +22% pancreatic cancer per 25 g/d (low quality).
- What do the results mean in everyday life?
Limit added sugar.
- What are the study's limitations?
Observational.
- What does it say about Elawady's specific claim?
Does not show sugar 'feeds' tumours.
- Do the results apply to Germany and Europe?
High.
- What can explicitly not be concluded from this study?
Effects in cancer patients.
Scientific in-depth review
1. Full reference
- Authors
- Huang Y et al.
- Journal
- BMJ
- Year
- 2023
- Identifier
- PMID 37019448 DOI 10.1136/bmj-2022-071609
- Verification
- verified – PubMed esummary + efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
National Natural Science Foundation of China; Sichuan province programme
2. Research question
Associations of dietary sugar with health outcomes.
3. Study design and population
- Study design
- Systematic review – Umbrella review of meta-analyses
- Population
Humans free of disease at baseline
- Country
International
- Period
Literature to search date
- Sample size
73 meta-analyses; 83 outcomes
- Inclusion and exclusion criteria
Meta-analyses of RCTs or observational studies
4. Methods and endpoints
- Exposure / intervention
Dietary sugar
- Comparator
Lower intake
- Endpoints
83 health outcomes
- Statistical methods
Evidence grading
5. Actual results
- Results
Harmful associations with 18 endocrine/metabolic, 10 cardiovascular, 7 cancer and 10 other outcomes. Moderate quality: SSB and body weight; added sugar and ectopic fat. Low quality: each 25 g/day fructose with 22% higher pancreatic cancer risk.
- Absolute risks
not reported
- Authors' conclusion
High sugar intake is generally more harmful than beneficial; limit free sugars to <25 g/day.
6. Strengths
- Comprehensive
7. Weaknesses
- Mostly observational, low-quality evidence for cancer outcomes
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
Umbrella review; quality of underlying evidence often low.
9. Assessment of the statistical interpretation
Cancer associations are low quality; strongest evidence for weight/cardiometabolic outcomes.
10. Relevance to the specific claim
Context for sugar and cancer: weak direct cancer evidence; indirect via body weight.
11. Independent contrary findings
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
Context; see sugar_soda team.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | indirect |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Effect of sugar intake in patients with existing cancer.
15. Linked fact checks
- The idea that 'sugar feeds cancer' should be dropped: sugar feeds every cell (and microbe), so cancer patients need not fear sugar. – Studies with mixed or unclear results