One diet soda per day nearly triples the risk of ischaemic stroke and of Alzheimer's dementia.
Original statement
تبيَّن أن مَن يشرب علبة دايت واحدة يومياً يرتفع لديه خطر السكتة الدماغية الإقفارية إلى ما يقرب من ثلاثة أضعاف (HR=2.96)، وخطر ألزهايمر أيضاً نحو ثلاثة أضعاف (HR=2.89).
verbatim according to source. Translation by the project; the Arabic wording is authoritative.
Translation
One diet soda per day nearly triples the risk of ischaemic stroke and of Alzheimer's dementia.
Origin
- Source status
- Archive editors
- Attribution
- Archive editors (study selection and narrative are the archive's, not necessarily Elawady's)
- Origin
- https://eltayebat.com/rule/soda/
- Attribution uncertainty
- The archive homepage states that the forbidden-food section is supported by research 'independently of Dr. Diaa's words'. No evidence was found that Elawady himself cited these studies.
- Claimed mechanism
Artificial sweeteners (partly via gut microbiome, according to the archive).
- Claimed health effect
Ischaemic stroke, Alzheimer's dementia.
- Population concerned
Adults >45/ >60 years
- Geographic restriction by Elawady
none found
Scientific assessment
Mostly false – Essential parts of the statement are not supported by the evidence or are strongly exaggerated.
Certainty of evidence: low – Further research is likely to change the assessment considerably.
1. What was claimed?
Daily diet soda roughly triples stroke and dementia risk.
2. What is demonstrably correct?
Pase 2017 (A-SOD-02) did report HR 2.96 (1.26-6.97) for ischaemic stroke and 2.89 (1.18-7.07) for Alzheimer's disease for daily cumulative intake vs none. Some larger studies also found positive, but much smaller, associations: WHI ischaemic stroke HR 1.31 for >=2/day (I-SOD-06); pooled Alzheimer RR 1.42 (I-SOD-105).
3. What is wrong or exaggerated?
The 'triple' magnitude rests on few events and very wide CIs, and is not reproduced in larger studies: a multicohort analysis with about 23 times the statistical weight found no dementia association (I-SOD-104), and the stroke association in WHI was far smaller. In Pase 2017 itself, the dementia association was no longer significant after adjustment for cardiometabolic factors (all-cause dementia HR 1.70, 0.80-3.61; Alzheimer's HR 2.03, 0.83-4.97), daily diet-soda drinkers had about three times the diabetes prevalence, and many comparisons were uncorrected. The archive's 'more than 4,000 adults' is inaccurate (2,888 for stroke, 1,484 for dementia). The link to the 2014 microbiome paper is the archive's speculation. Reverse causation (people with obesity or diabetes switch to diet drinks) is a recognised problem.
4. What remains unclear?
Whether artificially sweetened beverages have any causal effect on stroke or dementia.
5. Which studies support it?
A-SOD-02; I-SOD-06 and I-SOD-105 (direction, much smaller size).
6. Which studies contradict it?
I-SOD-104 (no dementia association in six cohorts), I-SOD-101 (stroke evidence weak), I-SOD-06 (much smaller stroke effect), I-SOD-105 (Alzheimer RR 1.42, not ~3); I-SOD-08 notes confounding in NSS evidence.
7. What applies to Germany and Europe?
EFSA and JECFA consider approved sweeteners safe within ADIs; no regulatory body has concluded that diet drinks cause stroke or dementia.
8. What is known about Egypt?
No Egypt-specific data.
9. What practical conclusion is appropriate?
There is no strong reason to drink diet sodas for health, but the claim that one a day triples stroke or dementia risk is not supported.
Assessment details
- Rationale for certainty of evidence
The 'nearly triple' estimates come from one small cohort (82 ischaemic strokes, 63 Alzheimer cases; very wide CIs). Larger datasets do not reproduce them: a six-cohort study of 10,974 older adults (I-SOD-104) found no association of diet drinks with dementia (HR 1.00, 0.83-1.21), a meta-analysis found a much smaller Alzheimer association (RR 1.42, I-SOD-105), WHI found ischaemic stroke HR 1.31 at >=2/day (I-SOD-06), and an umbrella review graded the stroke evidence as weak (I-SOD-101). Certainty is low because all data are observational and reverse causation is likely.
- Source quality
Numbers reported correctly, but the archive presents an imprecise association from one small cohort as a near-tripling of risk and links it causally to the microbiome without evidence.
- Regional transferability
Moderate.
- Individual exceptions
Not applicable.
- Regional scope of the claim
- general (biological/medical)
- Last reviewed
- 26 October 2026 provisional
Scientific evidence in detail
Overinterpreted – A real finding exists, but the claim draws more from it than the data allow (e.g. association taken as cause, animal data applied to humans, small effect presented as large).
Research question: Does one diet soda per day nearly triple the risk of ischaemic stroke and Alzheimer's dementia?
Research question in detail (PECO)
- Population
- Adults
- Intervention or exposure
- Artificially sweetened beverages >=1/day
- Comparison
- None or low
- Geographic scope
- universal
- Outcomes
- Ischaemic stroke
- Dementia/Alzheimer's disease
Study results as reported by the authors. Our assessment follows below.
What speaks for the claim?
Diet soda, stroke and dementia in Framingham
Pase MP et al.. Stroke 2017 · PMID 28428346 · DOI 10.1161/STROKEAHA.116.016027 Cohort studyfull text, structured risk-of-bias assessmentPase 2017 (Framingham Offspring): daily cumulative ASB intake HR 2.96 for ischaemic stroke and 2.89 for Alzheimer's disease.
- Actual result
- HR 2.96 (1.26-6.97); 2.89 (1.18-7.07).
- Methodological quality
- moderate (small cohort, high bias)
- Relevance
- direct
- Limitations
- 82 and 63 events; dementia association not significant after full adjustment.
Possible modest link between sweetened drinks and Alzheimer's
Jouni N et al.. Aging Ment Health 2025 · PMID 40511662 · DOI 10.1080/13607863.2025.2512215 Meta-analysisabstract checkednewly addedMeta-analysis: ASB associated with Alzheimer's disease (RR 1.42).
- Actual result
- RR 1.42 (1.14-1.78).
- Methodological quality
- moderate
- Relevance
- direct
- Limitations
- Few studies; includes Pase.
What speaks against the claim?
No dementia link for diet drinks in older adults
Chen H et al.. JAMA Psychiatry 2025 · PMID 40531522 · DOI 10.1001/jamapsychiatry.2025.1230 Cohort studyabstract checkednewly addedSix US cohorts (10,974 older adults, 2445 dementia cases): no association of ASB with dementia.
- Actual result
- ASB >=1/day HR 1.00 (0.83-1.21).
- Methodological quality
- high
- Relevance
- direct
- Limitations
- Late-life exposure.
Diet drinks and stroke in 81,000 women
Mossavar-Rahmani Y et al.. Stroke 2019 · PMID 30802187 · DOI 10.1161/STROKEAHA.118.023100 Cohort studyabstract checkedWHI (81,714 women): ischaemic stroke HR 1.31 at >=2 ASB/day.
- Actual result
- HR 1.31 (1.06-1.63).
- Methodological quality
- high
- Relevance
- direct
- Limitations
- Observational.
Diet drinks linked to several diseases in observational data
Diaz C et al.. Adv Nutr 2023 · PMID 37187453 · DOI 10.1016/j.advnut.2023.05.010 Systematic reviewabstract checkednewly addedUmbrella review: evidence for ASB and stroke graded weak.
- Actual result
- Stroke: weak credibility.
- Methodological quality
- moderate
- Relevance
- direct
- Limitations
- Observational.
What does the overall evidence say?
Editorial assessment based on the studies above – not itself a study result.
Which position is better supported?
Larger and more precise studies do not reproduce a tripling: stroke associations are about 1.3 at higher intakes, Alzheimer associations about 1.4 in a small meta-analysis, and a large multicohort study found no dementia association.
Why some studies weigh more
Estimates with 20-fold greater statistical weight (Chen 2025) and larger cohorts (WHI) outweigh one small cohort.
Is a causal relationship established? Not established Reverse causation (people with obesity/diabetes choose diet drinks) likely.
Remaining uncertainty
Whether any modest causal effect exists.
Justified conclusion
The 'nearly triple' figure is not reliable.
Why do studies seem to disagree?
Pase (AD) vs Chen (all-cause dementia): different outcomes, ages and adjustment; Chen includes the Framingham offspring cohort. The difference between Pase's AD estimate and Chen's estimate is statistically significant (ratio 2.89, p=0.023).
Does this depend on the country?
- General biological effects
- Universal.
- Legal rules
- Sweeteners authorised in the EU with ADIs.
A regional difference that changes the conclusion is not supported by robust data.
Statistical re-check
- Precision and comparison with larger studies – Pase AD SE(log) 0.457 vs Chen 0.096 (Chen ~23 times the weight); ratio Pase/Chen 2.89 (p=0.023); Pase/WHI stroke 2.26 (p=0.07) recalculated
Certainty of the overall evidence (GRADE, simplified)
- Main outcome
- Stroke and dementia with ASB
- Starting level
- low (observational studies)
- Reasons for downgrading
- imprecision
- risk of bias (reverse causation)
- inconsistency
- Result
- low
Simplified assessment by a single reviewer, following the GRADE approach; not a formal GRADE panel. GRADE rates the body of evidence for one outcome, not individual studies.
Clinical guidelines and official statements checked
- WHO: Use of non-sugar sweeteners: WHO guideline (2023), publication page (I-SOD-08) (2023) · Original publication
Guidance on NSS use to reduce unhealthy weight gain and NCD risk; not based on toxicological safety assessment and not intended to replace JECFA acceptable daily intakes; accompanying news release: recommends against NSS for weight control (conditional).
Search strategy
Documented literature searches for this review (search strings in the original database syntax).
| Database | Date | Search | Looking for | Hits | Included |
|---|---|---|---|---|---|
| Europe PMC | 26 October 2026 | ("artificially sweetened" OR "diet soda" OR "diet soft drink" OR "low-calorie sweetened" OR "non-sugar sweetener") AND (dementia OR "Alzheimer") AND (cohort OR "meta-analysis") | both directions | 176 | |
| Europe PMC | 26 October 2026 | ("artificially sweetened beverages" OR "diet soda") AND TITLE:(stroke) AND (cohort OR meta-analysis) | both directions | 27 | |
| Europe PMC | 26 October 2026 | (TITLE:"non-sugar sweeteners" OR TITLE:"artificially sweetened beverages" OR TITLE:"artificial sweeteners") AND (mortality OR cardiovascular OR stroke OR dementia) AND (meta-analysis) AND PUB_YEAR:[2019 TO 2026] | both directions | 63 |
Open questions
Midlife ASB intake and Alzheimer-specific outcomes.
How deeply was this checked?
6 linked studies: 2 checked in full text (1 of them with a structured risk-of-bias assessment), 4 on the basis of the abstract, 0 bibliographically only. No formal assessment with two independent reviewers and no independent human expert review has taken place yet.
Last scientific review: 26 October 2026
History of the verdict
- 25 October 2026 · Phase 1 · Initial assessment: Potentially false (very low)
- 26 October 2026 · Phase 4 (systematic evidence review) · Verdict changed: Potentially false (very low) → Mostly false (low)
Changed because the evidence base changed: a large multicohort study (I-SOD-104) found no dementia association and the meta-analysis (I-SOD-105) found a much smaller Alzheimer association; together with WHI they make the 'nearly triple' magnitude unlikely with low (no longer very low) certainty.
New sources: I-SOD-101 I-SOD-104 I-SOD-105
In plain language
One US study of under 3,000 people found that daily diet-soda drinkers had about three times more strokes and Alzheimer's disease. The number of cases was small and the uncertainty very large. Much larger studies found a far smaller link for stroke and, in about 11,000 older adults, no link with dementia at all. People with weight or diabetes problems often switch to diet drinks, which can create such links without the drink being the cause.
Studies on this claim
Studies supporting the claim (0)
No studies in this group.
Studies contradicting or limiting the claim (4)
-
Diet drinks and stroke in 81,000 women
Mossavar-Rahmani Y et al.. Stroke 2019 · PMID 30802187 · DOI 10.1161/STROKEAHA.118.023100Cohort studyindependent cross-checkabstract checkedWomen drinking two or more diet drinks daily had 31% more ischaemic strokes; far less than the 'triple' figure.
Does the study support the specific claim? Partly · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Is ASB intake associated with stroke, CHD and mortality?
- How was the study done?
Prospective cohort (WHI Observational Study).
- How many people, animals or samples were studied?
81,714; Postmenopausal women 50-79
- What was actually found?
>=2 ASB/day vs <1/week: all stroke HR 1.23 (1.02-1.47); ischaemic stroke 1.31 (1.06-1.63); CHD 1.29 (1.11-1.51); all-cause mortality 1.16 (1.07-1.26); small-artery occlusion stroke 2.44 in women without CVD/diabetes.
- How large was the observed effect?
HR 1.31 (1.06-1.63) ischaemic stroke
- What do the results mean in everyday life?
A modest association, possibly confounded.
- What are the study's limitations?
Reverse causation; Single population; Observational design; residual confounding possible; Self-reported dietary intake
- What does it say about Elawady's specific claim?
Mixed/limiting for C-SOD-06 (direction supported, magnitude much smaller).
- Do the results apply to Germany and Europe?
Moderate.
- What can explicitly not be concluded from this study?
Causation.
-
WHO on non-sugar sweeteners
World Health Organization. WHO news release 2023Guideline / position statementindependent cross-checkfull text checked★ key studyWHO advises not to use sweeteners for weight control, because no long-term benefit was shown; possible harms may be confounded.
Does the study support the specific claim? Partly · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Should NSS be used for weight control/NCD risk reduction?
- How was the study done?
International guideline (news release read in full).
- How many people, animals or samples were studied?
Not applicable; All people except those with pre-existing diabetes
- What was actually found?
Recommends against NSS to control weight or reduce NCD risk; NSS confer no long-term benefit for body fat; potential undesirable effects (T2D, CVD, mortality) from long-term use; recommendation conditional because observed links might be confounded by baseline characteristics and complicated patterns of NSS use.
- How large was the observed effect?
Not applicable
- What do the results mean in everyday life?
Water or unsweetened drinks are preferable.
- What are the study's limitations?
Conditional; observational evidence for harms
- What does it say about Elawady's specific claim?
Supports C-SOD-10 (no proven benefit); limits C-SOD-06 (confounding).
- Do the results apply to Germany and Europe?
Applies globally.
- What can explicitly not be concluded from this study?
That sweeteners cause disease.
-
Diet drinks linked to several diseases in observational data
Diaz C et al.. Adv Nutr 2023 · PMID 37187453 · DOI 10.1016/j.advnut.2023.05.010Systematic reviewindependent cross-checkabstract checked★ key studyAcross many studies, regular diet-drink consumers had more obesity, diabetes, hypertension, heart disease and deaths; stroke and heart-death links were weak.
Stroke evidence graded weak.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Grade the credibility of links between diet drinks and health.
- How was the study done?
Umbrella review of meta-analyses.
- How many people, animals or samples were studied?
55 underlying studies.
- What was actually found?
Several associations highly suggestive; stroke and cardiovascular mortality weak.
- How large was the observed effect?
Credibility classes, not single effect sizes.
- What do the results mean in everyday life?
Diet drinks are not proven healthy; causation unclear.
- What are the study's limitations?
Observational; reverse causation likely.
- What does it say about Elawady's specific claim?
Partly supports 'diet soda is not a safe alternative'; does not support strong stroke effects.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot show that sweeteners cause these diseases.
-
No dementia link for diet drinks in older adults
Chen H et al.. JAMA Psychiatry 2025 · PMID 40531522 · DOI 10.1001/jamapsychiatry.2025.1230Cohort studyindependent cross-checkabstract checked★ key studyAcross six US cohorts with about 11,000 older adults, diet drinks were not linked to dementia (HR 1.00).
No association of ASB with dementia (HR 1.00, 0.83-1.21).
Does the study support the specific claim? No · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Test whether sweetened drinks predict dementia in older adults.
- How was the study done?
Pooled six long-term cohorts.
- How many people, animals or samples were studied?
10,974 adults aged 65+; 2445 dementia cases.
- What was actually found?
No association for sugary or diet drinks.
- How large was the observed effect?
ASB >=1/day HR 1.00 (0.83-1.21).
- What do the results mean in everyday life?
Fear of tripled dementia risk from diet soda is not supported.
- What are the study's limitations?
Late-life intake only.
- What does it say about Elawady's specific claim?
Contradicts the claim.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot exclude effects of drinking diet soda in midlife.
No study in this group is marked as key.
Studies with mixed or unclear results (2)
-
Diet soda, stroke and dementia in Framingham
Pase MP et al.. Stroke 2017 · PMID 28428346 · DOI 10.1161/STROKEAHA.116.016027Cohort studycited by the Tayebat archivefull text, structured risk-of-bias assessment★ key studyDaily diet-soda drinkers had about three times more ischaemic strokes and Alzheimer's disease, but with very few cases and wide uncertainty.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Are sugar- or artificially sweetened beverages associated with incident stroke or dementia?
- How was the study done?
Prospective cohort (Framingham Offspring); FFQ at exams 5-7; 10-year surveillance; Cox models.
- How many people, animals or samples were studied?
2,888 (stroke; 97 strokes, 82 ischaemic); 1,484 (dementia; 81 cases, 63 Alzheimer); Framingham Offspring participants >45 y (stroke) and >60 y (dementia)
- What was actually found?
Daily cumulative ASB vs 0/week: ischaemic stroke HR 2.96 (1.26-6.97); Alzheimer's disease HR 2.89 (1.18-7.07). SSB not associated with stroke or dementia.
- How large was the observed effect?
HR 2.96 (1.26-6.97); HR 2.89 (1.18-7.07)
- What do the results mean in everyday life?
A worrying signal, but too imprecise to state a tripled risk.
- What are the study's limitations?
Few events; wide CIs; diabetes far more common in diet-soda drinkers; dementia result not robust to full adjustment; many comparisons
- What does it say about Elawady's specific claim?
Only direct evidence for C-SOD-06.
- Do the results apply to Germany and Europe?
Moderate.
- What can explicitly not be concluded from this study?
That diet soda causes stroke or dementia.
-
Possible modest link between sweetened drinks and Alzheimer's
Jouni N et al.. Aging Ment Health 2025 · PMID 40511662 · DOI 10.1080/13607863.2025.2512215Meta-analysisindependent cross-checkabstract checkedPooling seven cohort studies, diet drinks were linked to 42% higher Alzheimer's risk, far less than a tripling.
ASB-AD RR 1.42, not ~3.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Pool cohort studies on sweetened drinks and Alzheimer's.
- How was the study done?
Meta-analysis of prospective cohorts.
- How many people, animals or samples were studied?
Seven studies in the pooled analysis.
- What was actually found?
Sugary and diet drinks were both linked to higher Alzheimer's risk.
- How large was the observed effect?
ASB RR 1.42 (1.14-1.78).
- What do the results mean in everyday life?
A possible modest link; not proof.
- What are the study's limitations?
Few studies; includes the archive's study.
- What does it say about Elawady's specific claim?
Supports direction, not the size, of the claim.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot prove causation.
No study in this group is marked as key.
Regional context
Germany / EU
EFSA and JECFA consider approved sweeteners safe within ADIs; no regulatory body has concluded that diet drinks cause stroke or dementia.
Egypt
No Egypt-specific data.
What applies in my country?
General scientific assessment
Mostly false Mostly false: the 'triple risk' figure comes from one small study and is not reproduced by larger studies, which show at most modest associations.
The following areas of food safety are relevant to this statement:
- Additives and processing
- Controls, imports, recalls, labelling
Honey, sugar, sweets
Choose a country to see the checked information for it.
Limits: legal rules describe what is allowed, not what every single food contains. Measurement data come from samples and are meaningful only together with their method details.
Country of residence or purchase Compare with another country
References
- Artificially Sweetened Beverages and Stroke, Coronary Heart Disease, and All-Cause Mortality in the Women's Health Initiative.. Mossavar-Rahmani Y et al.. Stroke 2019 · PMID 30802187 · DOI 10.1161/STROKEAHA.118.023100
- WHO advises not to use non-sugar sweeteners for weight control in newly released guideline (Use of non-sugar sweeteners: WHO guideline, 2023) — news release. World Health Organization. WHO news release 2023
- Artificially Sweetened Beverages and Health Outcomes: An Umbrella Review.. Diaz C et al.. Adv Nutr 2023 · PMID 37187453 · DOI 10.1016/j.advnut.2023.05.010
- Sweetened Beverages and Incident All-Cause Dementia Among Older Adults.. Chen H et al.. JAMA Psychiatry 2025 · PMID 40531522 · DOI 10.1001/jamapsychiatry.2025.1230
- Sugar- and Artificially Sweetened Beverages and the Risks of Incident Stroke and Dementia: A Prospective Cohort Study.. Pase MP et al.. Stroke 2017 · PMID 28428346 · DOI 10.1161/STROKEAHA.116.016027
- The association between sugar- and artificially sweetened beverages and risk of Alzheimer's disease: systematic review and dose-response meta-analysis of prospective cohort studies.. Jouni N et al.. Aging Ment Health 2025 · PMID 40511662 · DOI 10.1080/13607863.2025.2512215