Risk assessmentindependent cross-checkfull text checked★ key study I-SYS-01 in-depth review
Poor diet is linked to about one in five adult deaths worldwide
Health effects of dietary risks in 195 countries, 1990-2017: a systematic analysis for the Global Burden of Disease Study 2017.
Overview
GBD 2017 Diet Collaborators. Lancet 2019 · PMID 30954305 · DOI 10.1016/S0140-6736(19)30041-8
11 million deaths in 2017 were attributed to dietary risks, mainly too much salt and too few whole grains and fruits.
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?
Quantify diet-attributable deaths.
- How was the study done?
GBD comparative risk assessment.
- How many people, animals or samples were studied?
195 countries.
- What was actually found?
11 million deaths (22%).
- How large was the observed effect?
Sodium 3 m, whole grains 3 m, fruit 2 m deaths.
- What do the results mean in everyday life?
Eat more whole grains and fruit, less salt.
- What are the study's limitations?
Observational inputs.
- What does it say about Elawady's specific claim?
Diet matters; the main dietary problems differ from the system's forbidden list.
- Do the results apply to Germany and Europe?
High.
- What can explicitly not be concluded from this study?
That food is the sole cause.
Scientific in-depth review
1. Full reference
- Authors
- GBD 2017 Diet Collaborators
- Journal
- Lancet
- Year
- 2019
- Identifier
- PMID 30954305 DOI 10.1016/S0140-6736(19)30041-8
- Verification
- verified – PubMed efetch 2026-10-25; full text via Europe PMC PMC6899507
- Retracted
- no
- Corrections
ErratumIn: Lancet 2021;397(10293):2466
- Extent checked
- full text
- Conflicts of interest and funding
Bill & Melinda Gates Foundation; erratum 2021
2. Research question
Deaths and DALYs attributable to dietary risks.
3. Study design and population
- Study design
- Risk assessment – Comparative risk assessment (GBD)
- Population
Adults >=25 y, 195 countries
- Country
Global
- Period
1990-2017
- Sample size
Global
- Inclusion and exclusion criteria
15 dietary risks
4. Methods and endpoints
- Exposure / intervention
Suboptimal intake of foods/nutrients
- Comparator
Optimal intake
- Endpoints
NCD deaths and DALYs
- Statistical methods
PAF
5. Actual results
- Results
2017: 11 million (95% UI 10-12) deaths and 255 million DALYs attributable to dietary risks; full text: 22% (21-24) of adult deaths and 15% of adult DALYs. Leading dietary risks: high sodium (3 million deaths), low whole grains (3 million), low fruits (2 million). Full text states suboptimal diet is responsible for more deaths than any other risk globally, including tobacco; it also notes that the strength of causal evidence is generally weaker than for tobacco or high blood pressure.
- Absolute risks
11 million deaths (22% of adult deaths) in 2017
- Authors' conclusion
Suboptimal diet is a leading preventable risk; improving diet across nations is urgent.
6. Strengths
- Global, systematic
- Full text read
7. Weaknesses
- Mostly observational RR inputs
- Mixed dietary data sources
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Model-based; causal evidence for diet weaker than for tobacco (authors).
9. Assessment of the statistical interpretation
Diet is a top-ranked risk, but the ranking relies on observational evidence and on a different grouping of risks than GBD 2019.
10. Relevance to the specific claim
Partly supports 'food is a leading cause of modern disease'; but the leading dietary risks are low whole grains, low fruit and high sodium - not the foods the system forbids.
11. Independent contrary findings
I-SYS-02 ranks high blood pressure and tobacco as top Level-2 risks for deaths (different aggregation).
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
Key evidence that diet matters a lot; does not show diet is 'the' cause or that the system's specific restrictions address the main dietary risks.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Overlap with high blood pressure/BMI pathways.
15. Linked fact checks
- Food is the first (leading) cause of modern (non-communicable) diseases. – Studies supporting the claim
- Chronic disease is mostly a cumulative reaction to what enters the body daily - contaminated food, medicines and cosmetics - not a fate that comes from outside. – Studies with mixed or unclear results
- Cross-system summary: avoiding the system's forbidden foods (industrial eggs, chicken, dairy, white flour, UPF, soft drinks, leafy greens, legumes, acid blockers, supplements) prevents cancer. – Studies with mixed or unclear results
- Third-party site: the Tayebat system can serve as a preventive lifestyle against cancer (less processed meat, refined sugar, fried food, soft drinks), not as treatment; cancer patients must follow their oncology team and keep screening. – Studies with mixed or unclear results