Study analysis · Cardiovascular Diabetology · 2024
Your daily sugar-free sweetener might be quietly raising your heart disease risk — and it’s not what you think.
Every extra teaspoon of artificial sweetener you add to your coffee or cereal each day slightly increases your risk of heart disease, mostly because it raises your chance of getting type 2 diabetes first.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
In simple terms
This study watched a big group of people over time and noticed that those who used more artificial sweeteners also tended to get heart problems more often. But it didn’t make anyone use sweeteners—it just watched what people already did, so we can’t say the sweeteners caused the problems.
What’s the bottom line?
This study looked at people who used sugar-free sweeteners like Canderel in their coffee or cereal and tracked if they got heart problems later.
How strong is this study?
This study did a really good job collecting lots of info—what people ate, how active they were, their health history—and tried to account for other things that could affect heart health. But because it didn’t control who used sweeteners, we still can’t be 100% sure the sweeteners themselves are the problem.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
56 / 100
- Randomizationnot randomized
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=133285)+20/20
- Follow-up+10/10
100 / 100
77 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervals+15/15
- Pre-registrationnot pre-registered
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 567 / 100
Probability of being correct
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
This design cannot establish causation — the findings describe an association, not a cause. This is an observational cohort study with no randomization or intervention; it can identify associations but cannot rule out confounding factors or establish direct cause-effect relationships.
No Conflicts
No conflicts of interest identified
No conflicts of interest or funding statements were disclosed in the study text; no industry ties or funder involvement were identified.
The study uses publicly available UK Biobank data with no mention of funding sources, author affiliations with industry, or funder roles. While the absence of a COI statement is notable, there is no evidence of bias or industry influence in the reported methods or results.
Key takeaways
- 01
For every extra teaspoon of sweetener per day, people had a 1.2% higher chance of heart disease, 1.8% higher chance of clogged heart arteries, and 3.5% higher chance of leg artery disease — and most of this risk came from developing type 2 diabetes first.
- 02
Even small daily increases in sweetener intake added up to measurable heart risks over time, especially for non-white people and those without obesity.
Surprising findings
- People without obesity (BMI < 30) showed a higher trend in heart disease risk from sweeteners than those who were obese.It’s counterintuitive because obesity is the usual suspect in metabolic disease — but here, leaner people were more vulnerable, suggesting sweeteners may disrupt metabolism differently in non-obese individuals.
- The link between artificial sweeteners and heart failure was only marginally significant (HR 1.018, CI 0.999–1.038), yet still present.Heart failure is often linked to heavy sugar or salt intake — but this suggests even low-calorie sweeteners might quietly strain the heart muscle over time.
Practical takeaways
If you use artificial sweeteners daily, try cutting back to 2–3 times per week and replace with water, unsweetened tea, or fruit-infused drinks.
This study shows association, not causation — and the absolute risk increase is small per person. Don’t panic, but be mindful.
medium confidenceIf you’re non-white or have prediabetes, consider avoiding artificial sweeteners altogether — the risk appears amplified in these groups.
The study didn’t test specific sweeteners (like aspartame vs. erythritol), so we don’t know which ones are riskiest.
medium confidenceTrack your sweetener intake for a week — most people don’t realize how many teaspoons they consume daily across coffee, cereal, and yogurt.
Self-reported dietary data may under- or overestimate intake — but the trend held across sensitivity analyses.
medium confidenceWhy this study matters
1.2% More Heart Disease Per Teaspoon
For every additional teaspoon of artificial sweetener consumed daily, participants had a 1.2% higher risk of overall cardiovascular disease (HR 1.012), 1.8% higher risk of coronary artery disease, and 3.5% higher risk of peripheral artery disease — even after adjusting for diet, weight, and genetics.
Most people think sugar-free means heart-safe, but this shows tiny daily habits add up to measurable health risks over time — especially if you’re not overweight.
70% of the Risk Comes From Diabetes
The study found that 70% of the increased cardiovascular disease risk from artificial sweeteners was mediated by the development of type 2 diabetes — meaning most of the harm happens because sweeteners contribute to insulin resistance and diabetes first.
This flips the script: it’s not the sweetener directly clogging arteries — it’s how it triggers metabolic dysfunction that then leads to heart disease.
Non-White Populations at Higher Risk
The association between artificial sweeteners and heart disease was significantly stronger in non-white participants, suggesting biological or metabolic differences in how these populations process sweeteners.
This challenges the one-size-fits-all health advice — it means dietary guidelines may need to be tailored by ethnicity, not just BMI or lifestyle.
No Genetic Shield — Even Low-Risk People Are Affected
People with low genetic risk for heart disease saw the same increase in CVD risk from sweeteners as those with high genetic risk — meaning your DNA doesn’t protect you from this exposure.
If you’ve been told ‘I’m genetically lucky, I can eat whatever,’ this study says: not when it comes to artificial sweeteners.
Want the whole report?
Detailed mode opens the full scientific breakdown — every score component, the methodology, conflicts of interest, the evidence analysis behind each claim, and the raw study data.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
This study looked at people who used sugar-free sweeteners like Canderel in their coffee or cereal and tracked if they got heart problems later.
Research results
For every extra teaspoon of sweetener per day, people had a 1.2% higher chance of heart disease, 1.8% higher chance of clogged heart arteries, and 3.5% higher chance of leg artery disease — and most of this risk came from developing type 2 diabetes first.
What this means - more context
Even small daily increases in sweetener intake added up to measurable heart risks over time, especially for non-white people and those without obesity.
To assess the association between artificial sweetener intake and incident cardiovascular disease (CVD) and its subtypes, and to evaluate the roles of genetic susceptibility and type 2 diabetes as mediators.
Higher artificial sweetener intake was associated with increased risk of overall CVD, coronary artery disease, peripheral arterial disease, and marginally with heart failure, independent of lifestyle, metabolic, and genetic factors. The association was stronger in non-white populations and largely mediated by type 2 diabetes, which explained 70% of the CVD risk increase.
Methods Used
Prospective cohort study of 133,285 UK Biobank participants free of CVD and diabetes at baseline; artificial sweetener intake measured via repeated 24-hour dietary recalls; Cox proportional hazards models adjusted for age, sex, ethnicity, BMI, diet, lifestyle, and socioeconomic factors; polygenic risk scores used for genetic susceptibility; time-dependent mediation analysis for type 2 diabetes.
Main Finding
Each additional teaspoon of artificial sweetener per day was associated with a 1.2% increased risk of overall CVD (HR 1.012, 95% CI: 1.008–1.017), 1.8% increased risk of coronary artery disease (HR 1.018, 95% CI: 1.001–1.035), and 3.5% increased risk of peripheral arterial disease (HR 1.035, 95% CI: 1.010–1.061); 70% of this CVD risk was mediated by incident type 2 diabetes.
Confidence Level
Moderate to high; large sample size, extensive covariate adjustment, sensitivity analyses, and mediation modeling support robustness, but observational design limits causal inference.
Study Flags
Red Flags
- •Cannot prove causation
- •Dietary intake measured by self-reported recalls (potential recall bias)
- •Limited to European ancestry in genetic analyses
Surprising Findings
People without obesity (BMI < 30) showed a higher trend in heart disease risk from sweeteners than those who were obese.
It’s counterintuitive because obesity is the usual suspect in metabolic disease — but here, leaner people were more vulnerable, suggesting sweeteners may disrupt metabolism differently in non-obese individuals.
Practical Takeaways
If you use artificial sweeteners daily, try cutting back to 2–3 times per week and replace with water, unsweetened tea, or fruit-infused drinks.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 567 / 100
Probability of being correct
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Human Cohort Study
Subject
Moderate probability
on the GRADE evidence scale
This study watched a big group of people over time and noticed that those who used more artificial sweeteners also tended to get heart problems more often. But it didn’t make anyone use sweeteners—it just watched what people already did, so we can’t say the sweeteners caused the problems.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Large sample size (n=133,285)
- Detailed, repeated dietary assessments using 24-hour recalls
- Comprehensive adjustment for numerous confounders (demographics, lifestyle, diet, health status)
Weaknesses
- Observational design with no randomization
- Potential for residual confounding (e.g., unmeasured dietary or behavioral factors)
- Dietary data based on self-reported recalls, subject to memory and reporting bias
Methodology
Evidence Keywords
Statistical Reporting
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
This study looked at people who used sugar-free sweeteners like Canderel in their coffee or cereal and tracked if they got heart problems later.
Research results
For every extra teaspoon of sweetener per day, people had a 1.2% higher chance of heart disease, 1.8% higher chance of clogged heart arteries, and 3.5% higher chance of leg artery disease — and most of this risk came from developing type 2 diabetes first.
What this means - more context
Even small daily increases in sweetener intake added up to measurable heart risks over time, especially for non-white people and those without obesity.
To assess the association between artificial sweetener intake and incident cardiovascular disease (CVD) and its subtypes, and to evaluate the roles of genetic susceptibility and type 2 diabetes as mediators.
Higher artificial sweetener intake was associated with increased risk of overall CVD, coronary artery disease, peripheral arterial disease, and marginally with heart failure, independent of lifestyle, metabolic, and genetic factors. The association was stronger in non-white populations and largely mediated by type 2 diabetes, which explained 70% of the CVD risk increase.
Methods Used
Prospective cohort study of 133,285 UK Biobank participants free of CVD and diabetes at baseline; artificial sweetener intake measured via repeated 24-hour dietary recalls; Cox proportional hazards models adjusted for age, sex, ethnicity, BMI, diet, lifestyle, and socioeconomic factors; polygenic risk scores used for genetic susceptibility; time-dependent mediation analysis for type 2 diabetes.
Main Finding
Each additional teaspoon of artificial sweetener per day was associated with a 1.2% increased risk of overall CVD (HR 1.012, 95% CI: 1.008–1.017), 1.8% increased risk of coronary artery disease (HR 1.018, 95% CI: 1.001–1.035), and 3.5% increased risk of peripheral arterial disease (HR 1.035, 95% CI: 1.010–1.061); 70% of this CVD risk was mediated by incident type 2 diabetes.
Confidence Level
Moderate to high; large sample size, extensive covariate adjustment, sensitivity analyses, and mediation modeling support robustness, but observational design limits causal inference.
Study Flags
Red Flags
- •Cannot prove causation
- •Dietary intake measured by self-reported recalls (potential recall bias)
- •Limited to European ancestry in genetic analyses
Surprising Findings
People without obesity (BMI < 30) showed a higher trend in heart disease risk from sweeteners than those who were obese.
It’s counterintuitive because obesity is the usual suspect in metabolic disease — but here, leaner people were more vulnerable, suggesting sweeteners may disrupt metabolism differently in non-obese individuals.
Practical Takeaways
If you use artificial sweeteners daily, try cutting back to 2–3 times per week and replace with water, unsweetened tea, or fruit-infused drinks.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 567 / 100
Probability of being correct
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Human Cohort Study
Subject
Moderate probability
on the GRADE evidence scale
This study watched a big group of people over time and noticed that those who used more artificial sweeteners also tended to get heart problems more often. But it didn’t make anyone use sweeteners—it just watched what people already did, so we can’t say the sweeteners caused the problems.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Large sample size (n=133,285)
- Detailed, repeated dietary assessments using 24-hour recalls
- Comprehensive adjustment for numerous confounders (demographics, lifestyle, diet, health status)
Weaknesses
- Observational design with no randomization
- Potential for residual confounding (e.g., unmeasured dietary or behavioral factors)
- Dietary data based on self-reported recalls, subject to memory and reporting bias
Methodology
Evidence Keywords
Statistical Reporting
Scoring
How strong is this study?
This study did a really good job collecting lots of info—what people ate, how active they were, their health history—and tried to account for other things that could affect heart health. But because it didn’t control who used sweeteners, we still can’t be 100% sure the sweeteners themselves are the problem.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
56 / 100
- Randomizationnot randomized
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=133285)+20/20
- Follow-up+10/10
100 / 100
77 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervals+15/15
- Pre-registrationnot pre-registered
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 567 / 100
Probability of being correct
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
This design cannot establish causation — the findings describe an association, not a cause. This is an observational cohort study with no randomization or intervention; it can identify associations but cannot rule out confounding factors or establish direct cause-effect relationships.
No Conflicts
No conflicts of interest identified
No conflicts of interest or funding statements were disclosed in the study text; no industry ties or funder involvement were identified.
The study uses publicly available UK Biobank data with no mention of funding sources, author affiliations with industry, or funder roles. While the absence of a COI statement is notable, there is no evidence of bias or industry influence in the reported methods or results.
Standing
Who’s using this study?
The videos and claims on this site that lean on this study, and the researchers who wrote it.
1 video from Doctor Alex cite this study, drawing 1 claim from it.
- Very strong evidence
Randomized or controlled trials support this claim, alongside consistent supporting evidence.
Evidence
Authored by
14 researchersIf this is your work, this is how we attribute it on Fit Body Science. Tao Sun is listed as the lead author.