Is moderate drinking good or bad for your heart?
Short answer
Not shown to help; may harm.
Population studies link light drinking to fewer heart deaths, but light drinkers also have healthier habits. Gene studies, less open to that bias, find no protection and higher stroke risk.
This page says what the research shows. It does not say whether you should drink alcohol.
Where the evidence stands
Each dot is one on-topic paper. Steps near the top answer the question more directly. Select a dot to see the study.
↑ Stronger evidence
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Trials in people: heart disease
Trials that measured heart disease and death directly.
0Not done yet. This is the step that would answer the question.
-
Trials in people: other measures
Trials that measured other health or performance measures.
0None among the papers we read.
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Trials in people: lab tests or safety
Trials that measured lab tests, side effects or safety.
0None among the papers we read.
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Population studies
Studies that followed or surveyed groups of people. They show links, not causes.
5 -
Blood levels and genes
Studies that link blood levels or genes to health.
6
↓ Weaker evidence
- Points to benefit
- Mixed
- No difference
- No direction
- Points to harm
Not on the ladder: 2 reviews of many studies (shown below), 8 opinion or narrative papers. Counts are papers, not people. Some studies appear in more than one paper.
See every studyWhat we found
- Population studies often link light to moderate drinking with fewer heart attacks and heart deaths than not drinking. These studies show links, not causes. Carr 2024, Ajani 2000, Djoussé 2009, Millwood 2019
- Gene studies, built to reduce bias, found no protection from moderate drinking. Several tied more drinking to higher stroke or heart disease risk; pooled gene data showed no link. Carr 2024, Millwood 2023, Millwood 2019, Biddinger 2022, Hu 2022
- Light to moderate drinkers had healthier lifestyles; adjusting for this weakened the apparent benefit. In Spain, analyses least open to non-drinker (abstainer) bias showed no clear link. Biddinger 2022, Martínez-González 2026
- No long-term trial has tested drinking against heart events. A Spanish trial planned to randomly assign more than 10,000 drinkers to quitting or moderation advice. Hoek 2022, Martínez-González 2024
What the research says
Population studies link light drinking to fewer heart deaths
Among 87 938 US male doctors, daily drinkers had a heart disease death risk of 0.61 (below 1 means lower) versus rare or never drinkers. Among 26 399 women, 5 to 14.9 g of alcohol a day was linked to 51% lower heart death than abstaining.
A review of 56 cohorts linked wine at 1-4 drinks a week to lower heart death than beer or spirits. A pooled review linked low to moderate drinking to lower heart attack risk in cohort and case-control data. These are links, not proof of cause.
Studies: Ajani 2000, Djoussé 2009, Krittanawong 2022, Carr 2024
Gene studies find no protection, and stroke harm
In Chinese adults, self-reported moderate drinking looked protective. Gene-predicted drinking raised stroke risk (RR 1·27 per 280 g a week for clot strokes) and had no clear effect on heart attack (RR 0·96). A later analysis of 512 724 adults found no genetic evidence of protection from heart death.
In 371 463 UK adults, each step up in gene-predicted drinking was linked to 1.4-fold higher coronary artery disease risk; light drinking added little, heavier drinking much more. In Chinese men, risk rose in a straight line with gene-predicted drinking. Pooled gene data showed no link.
Studies: Millwood 2019, Millwood 2023, Biddinger 2022, Hu 2022, Carr 2024
Why population and gene studies disagree
Light to moderate drinkers had healthier lifestyles, and adjusting for this weakened the apparent benefit. Reviews say lifestyle, genetic and income differences likely explain much of the wine link, and that healthier traits of moderate drinkers versus never drinkers may skew results.
Who counts as a non-drinker matters. In Chinese adults, ex-drinkers and non-drinkers had higher death risks than moderate drinkers. In PREDIMED, analyses least open to abstainer bias showed no clear link. A UK study that compared against occasional drinkers, not non-drinkers, found higher, not lower, death risks with more drinking.
Studies: Biddinger 2022, Krittanawong 2022, Au Yeung 2013, Millwood 2023, Martínez-González 2026, Ortolá 2024
Spanish wine studies show links, with caveats
In PREDIMED, good followers of the Mediterranean diet, counting wine, had fewer heart events (HR 0.55) than poor followers. Not counting wine, the HR was 0.84, a range crossing no effect. A younger Spanish cohort showed no clear link. A wine industry body helped fund this work.
In the same trial, a urine marker of wine matching about 3-12 and 12-35 glasses a month was linked to fewer heart events (HR 0.62 and 0.50). The first range reached no effect (0.38; 1.00).
Studies: Martínez-González 2026, Domínguez-López 2025
Older drinkers with health or income risks
In 135 103 UK drinkers aged 60 and older, versus occasional drinkers, high-risk drinking was linked to higher heart death (HR, 1.21). Moderate-risk drinking was linked to higher death from any cause (HR, 1.10). Even low-risk drinking was linked to higher death in people with health or income risks.
Studies: Ortolá 2024
What reviews of many studies found
Reviews pool or sum up earlier studies. They are not on the ladder, because they repeat studies already counted there.
Pooled review (meta-analysis) · Carr 2024
Re-analyzed cohort, case-control and gene-based studies (counts not given in the abstract). Cohort and case-control data linked low to moderate drinking to lower heart disease and heart attack risk; pooled gene data showed no link.
Systematic review · Krittanawong 2022
Reviewed 56 cohorts with 1,579,435 people. Wine at 1-4 drinks a week was linked to lower heart death than beer or spirits; heavier drinking to higher heart death. Authors say lifestyle and other factors likely explain much of this.
Opinion or narrative review · Serio 2023
Selected 27 trials and case-control studies from 2002 to 2022, without pooling. It concluded moderate red wine lowers heart disease risk, but could not say whether alcohol or other wine parts are responsible.
How the research grew
The papers we read span 2000 to 2026. 6 of the 21 on-topic papers came out in 2024 to 2026.
- 2000–04
- 2005–09
- 2010–14
- 2015–19
- 2020–24
- 2025–26
Each dot is one on-topic paper, colored by what it found. Rings mark key papers:
- 2000. Daily drinking linked to fewer heart deaths in doctors. Ajani 2000
- 2013. Early gene study finds no heart protection. Au Yeung 2013
- 2019. Gene study of 500 000: drinking raises stroke risk. Millwood 2019
- 2022. Healthier habits weakened benefit; genes tied drinking to harm. Biddinger 2022
- 2024. Pooled review: population and gene studies disagree. Carr 2024
Who was studied
Who took part, and how many. There are no trials in people here. The largest population study had 512,724 people.
- Population, blood and gene studies
- 512,715 people · Millwood 2019
512,715 Chinese adults; about a third of men drank most weeks, very few women - 30,580 people · Martínez-González 2026
7447 older Spanish adults at high heart risk (PREDIMED) and 23,133 younger Spanish adults (SUN) - People in the study, log scale1101001,00010,000100,0001,000,000
- Points to benefit
- Mixed
- No difference
- No direction
- Points to harm
Bars use a log scale: each step is ten times more people. Reviews, animal studies and papers with no count in the abstract are not shown.
Who funds this research
There are no trial papers. Three population or gene papers list company funding: a Spanish wine industry body for one PREDIMED analysis, and GlaxoSmithKline, a drug maker, for two China studies. This did not change the confidence.
- Company stake 3
- No disclosure in PubMed 4
- No stake declared 6
- Martínez-González 2026Company stake
- Millwood 2023Company stake
- Millwood 2019Company stake
- Domínguez-López 2025No disclosure in PubMed
- Ajani 2000No disclosure in PubMed
- Djoussé 2009No disclosure in PubMed
- Hu 2022No disclosure in PubMed
- Krittanawong 2022No stake declared
- Carr 2024No stake declared
- Au Yeung 2013No stake declared
- Biddinger 2022No stake declared
- Ortolá 2024No stake declared
- Ye 2025No stake declared
Funding rule. A stake is always shown. Confidence is lowered only when every supporting study comes from a party with a stake. "No disclosure in PubMed" means the PubMed record has no conflict-of-interest statement. It does not mean there is no conflict.
What to watch
UNATI: a trial of drinking advice
A 4-year Spanish trial, publicly funded, will randomly assign more than 10,000 current drinkers aged 50 to 75 to advice on quitting or on drinking moderately. Its main measure includes death from any cause. Recruitment was to begin in mid-2024. Martínez-González 2024
All 21 on-topic papers
Each paper shows what it tested, what it found, and who has a stake. Every paper also has its own page that explains how much it counts and how it fits. See every study as a list.
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Wine consumption, Mediterranean diet, and cardiovascular risk in two Spanish cohorts.
30,580 people · 7447 older Spanish adults at high heart risk (PREDIMED) and 23,133 younger Spanish adults (SUN)
TestedGood Mediterranean diet habits with or without wine (about seven or more glasses a week) vs poor habits; followed 4.8 to 22 years
In PREDIMED, good diet followers counting wine had fewer heart events (HR 0.55, 95% CI 0.36-0.83) than poor followers; not counting wine, HR was 0.84 (0.61-1.15). Analyses least open to abstainer bias, and the SUN cohort, showed no clear link.
MixedCompany stakeAbstract onlyFunding includes Interprofesional del vino de España (OIVE), a Spanish wine industry group.
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Urinary tartaric acid as a biomarker of wine consumption and cardiovascular risk: the PREDIMED trial.
1,232 people · older Spanish adults at high heart risk in the PREDIMED trial
TestedWine intake measured by a urine marker (about 3-35 glasses a month) vs lowest marker group
Urine marker levels matching 3-12 and 12-35 glasses a month had lower heart event risk: HR 0.62 (95% CI 0.38; 1.00) and HR 0.50 (95% CI 0.27; 0.95).
Points to benefitNo disclosure in PubMedAbstract onlyNo COI statement in PubMed; public grants listed.
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Alcohol Consumption Patterns and Mortality Among Older Adults With Health-Related or Socioeconomic Risk Factors.
135,103 people · 135,103 UK drinkers aged 60 and older, followed 12 years
TestedLow-risk, moderate-risk and high-risk drinking vs occasional drinking (2.86 g a day or less)
Moderate-risk drinking was linked to higher all-cause death (HR, 1.10; 95% CI, 1.03-1.18) and cancer death. High-risk drinking also had higher heart death (HR, 1.21; 95% CI, 1.04-1.41). No links for low or moderate drinking in people without risk factors.
Points to harmNo stake declaredAbstract onlyNo conflicts reported.
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Alcohol consumption and risk of cardiovascular disease and death in women: potential mediating mechanisms.
26,399 people · 26,399 women followed an average of 12.2 years
TestedDrinking 5 to 14.9 g of alcohol a day vs not drinking
Drinking 5 to 14.9 g/d was linked to 26% lower heart disease, 35% lower total death and 51% lower heart death than abstainers, in a J-shaped pattern.
Points to benefitNo disclosure in PubMedAbstract onlyNo COI statement in PubMed; NIH grants listed.
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Alcohol consumption and risk of coronary heart disease by diabetes status.
87,938 people · 87,938 male US doctors, 2790 of them with diabetes, followed 5.5 years
TestedRare or no drinking vs monthly, weekly or daily drinking
Death from heart disease: in men without diabetes, relative risk was 0.61 (95% CI 0.49 to 0.78) for daily drinkers. In men with diabetes it was 0.42 (95% CI 0.23 to 0.77).
Points to benefitNo disclosure in PubMedAbstract onlyNo COI statement in PubMed; government grants listed.
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Smoking, Alcohol Consumption, and Atrial Fibrillation: Mendelian Randomization Study.
people in public gene databases
TestedGene-predicted alcohol use and drinking frequency vs risk of atrial fibrillation, alongside smoking
No causal link was found between alcohol drinking measures and atrial fibrillation. Smoking did show a link (current smoking OR: 1.413, 95% CI = 1.058-1.888).
No differenceNo stake declaredAbstract onlyAuthors declare no commercial or financial relationships.
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Alcohol intake and cause-specific mortality: conventional and genetic evidence in a prospective cohort study of 512 000 adults in China.
512,724 people · 512,724 Chinese adults aged 30 to 79, followed 12 years
TestedSelf-reported drinking and gene-predicted drinking (4 to 255 g a week in men)
Among drinkers, each 100 g a week was linked to higher heart death (HR 1·19 [1·15-1·24]). Gene-predicted drinking in men also raised heart death (HR 1·15 [1·10-1·19]), mostly stroke. No gene evidence that moderate drinking protects.
Points to harmCompany stakeAbstract onlyNo competing interests declared; funders include GlaxoSmithKline, not an alcohol maker.
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Association of Habitual Alcohol Intake With Risk of Cardiovascular Disease.
371,463 people · 371,463 UK adults, average age 57, who drank about 9 drinks a week
TestedSelf-reported drinking and gene-predicted drinking, light to heavy, followed up to 2016
Healthy habits among light drinkers weakened the apparent benefit. Gene-based analysis: each 1-SD rise in predicted drinking gave 1.4-fold (95% CI, 1.1-1.8) higher coronary artery disease risk. Light drinking added little risk; heavy drinking added much more.
Points to harmNo stake declaredAbstract onlyAuthor ties are to drug and gene-test firms, not alcohol makers.
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Gene study (Mendelian randomization)Hu et al., 2022The American journal of clinical nutrition · PubMed
Causal associations of alcohol consumption with cardiovascular diseases and all-cause mortality among Chinese males.
40,386 people · 40,386 Chinese men, 17,676 with gene data
TestedSelf-reported drinking (light up to 25 g a day, moderate 25 to 60 g) and gene-predicted drinking
Self-reported light and moderate drinking showed lower risk. Gene-predicted drinking raised heart disease risk: HR 1.18 (1.01, 1.38) and 1.22 (1.03, 1.46) in higher thirds. Excluding heavy drinkers, risk of heart disease and of death from any cause rose 27% and 20% per drink.
Points to harmNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
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Conventional and genetic evidence on alcohol and vascular disease aetiology: a prospective study of 500 000 men and women in China.
512,715 people · 512,715 Chinese adults; about a third of men drank most weeks, very few women
TestedSelf-reported drinking (about 100 g a week) and gene-predicted drinking (4 to 256 g a week), followed about 10 years
Self-reported drinking had U-shaped links with stroke and heart attack. Gene-predicted drinking raised stroke risk (RR per 280 g per week 1·27, 1·13-1·43 for ischaemic stroke) but not heart attack (RR 0·96, 95% CI 0·78-1·18).
MixedCompany stakeAbstract onlyNo disclosure in PubMed; funders include GlaxoSmithKline, not an alcohol maker.
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Moderate alcohol use and cardiovascular disease from Mendelian randomization.
men in the Guangzhou Biobank Cohort Study in China
TestedGene-predicted alcohol use (10 g ethanol a day) and heart risk factors and self-reported heart disease
Alcohol was linked to higher HDL cholesterol and diastolic blood pressure. Self-reported heart disease showed no clear link: OR 0.98 (95% CI 0.76 to 1.27) for CVD and OR 1.10 (95% CI 0.83 to 1.45) for IHD.
No differenceNo stake declaredAbstract onlyOnly journal editor roles declared; no company ties.
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A burden of proof study on alcohol consumption and ischemic heart disease.
adults in cohort, case-control and gene-based studies
TestedLow to moderate alcohol drinking vs none, compared across study types
Cohort and case-control studies linked low to moderate drinking to lower heart disease risk. Pooled gene-based (Mendelian randomization) studies found no link. The two kinds of study disagree.
MixedNo stake declaredAbstract onlyFunded by Gates Foundation and public bodies; no alcohol company ties declared.
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Alcohol Consumption and Cardiovascular Health.
56 studies, 1,579,435 people · adults in 56 cohort studies from several countries
TestedLight to moderate drinking (such as 1-4 glasses of wine a week) vs beer, spirits or heavier drinking
Wine at 1-4 drinks per week was linked to lower heart death than beer or spirits. Heavier drinking of any kind was linked to higher heart death. The authors say lifestyle and other factors likely explain much of the wine benefit.
MixedNo stake declaredAbstract onlyAuthor ties are to drug companies and journals, not alcohol makers.
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Opinion or narrative reviewMartínez-González, 2024The American journal of clinical nutrition · PubMed
Should we remove wine from the Mediterranean diet?: a narrative review.
adults, from studies of wine and the Mediterranean diet
TestedReview of light to moderate alcohol or red wine and heart disease and death
Non-randomized studies link light to moderate drinking to lower heart disease and death. But alcohol raises cancer and other risks, and gene studies suggest zero is healthiest. A 10,000-person trial (UNATI) is planned.
No weight on the ladderNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
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Moderate red wine intake and cardiovascular health protection: a literature review.
adults, from 27 trials and case-control studies
TestedModerate red wine (up to 2 units a day for men, 1 for women)
The authors say epidemiological evidence shows moderate red wine lowers risk of heart disease and diabetes. It is unclear whether alcohol or other wine parts cause this.
No weight on the ladderNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
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Alcohol Consumption and Cardiovascular Disease Risk: Placing New Data in Context.
adults, from studies of moderate drinking and heart disease
TestedReview of moderate drinking vs not drinking
Observational studies often show lower heart attack risk in moderate drinkers than in abstainers. Gene studies are inconclusive. No long-term trial exists, and the authors call for one.
No weight on the ladderNo stake declaredAbstract onlyDeclared grants were from NIH, a blueberry council and AHA, none from alcohol makers.
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Opinion or narrative reviewIkehara et al., 2020Hypertension research : official journal of the Japanese Society of Hypertension · PubMed
Alcohol consumption and risks of hypertension and cardiovascular disease in Japanese men and women.
Japanese men and women in large cohort studies
TestedReview of drinking amounts, from light (0.1-22.9 g ethanol a day) to heavy (46 g a day or more)
Drinking raised high blood pressure risk. Men showed a J-shaped link with stroke and heart disease. In women, light drinking was linked to lower total heart disease death but not lower stroke risk; heavy drinking raised risk.
No weight on the ladderNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
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Benefits and Risks of Moderate Alcohol Consumption on Cardiovascular Disease: Current Findings and Controversies.
adults, from many studies on alcohol and heart disease
TestedReview of low to moderate drinking and heart disease risk
Risk can go up or down with the amount, pattern and type of drink. Most data are observational, so the heart benefit of light drinking may be overestimated. Safe amount remains unclear.
No weight on the ladderNo stake declaredAbstract onlyNo competing interests declared.
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Alcohol and Cardiovascular Disease: How Much is Too Much?
adults, from many studies on alcohol and heart disease
TestedReview of low to moderate vs heavy drinking and heart disease
Heavy and binge drinking raise heart risk. New work does not support stroke protection from low to moderate drinking. Irregular heartbeat (atrial fibrillation) risk rises steadily with drinking, and gene studies suggest alcohol may directly cause heart harm.
No weight on the ladderNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
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Cardiovascular risks and benefits of moderate and heavy alcohol consumption.
adults, from studies of alcohol and heart health
TestedReview of low-to-moderate and heavy drinking
Heavy or binge drinking clearly harms the heart. Observational studies show low-to-moderate drinking linked to fewer heart events and deaths than abstaining, but gene studies cast doubt on this benefit.
No weight on the ladderNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
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Alcohol and its relation to all-cause and cardiovascular mortality.
adults, from prospective studies
TestedReview of light-to-moderate drinking and heart disease and death
Light-to-moderate drinking was linked to lower heart disease death, with no further gain above 30 g a day. The all-cause death benefit is small and heavy drinking is harmful, so more drinking is not advised.
No weight on the ladderNo disclosure in PubMedAbstract onlyNo disclosure in PubMed.
33 papers we read and set aside as off topic
- Hughes et al., 2017. The effect of multiple adverse childhood experiences on health: a systematic review and meta-analysis. (pooled review (meta-analysis))
- Cecchini et al., 2024. Alcohol Intake and Risk of Hypertension: A Systematic Review and Dose-Response Meta-Analysis of Nonexperimental Cohort Studies. (pooled review (meta-analysis))
- Rees et al., 2019. Mediterranean-style diet for the primary and secondary prevention of cardiovascular disease. (pooled review (meta-analysis))
- Kim et al., 2019. Coffee consumption and all-cause and cause-specific mortality: a meta-analysis by potential modifiers. (pooled review (meta-analysis))
- Fuchs et al., 2021. The Effect of Alcohol on Blood Pressure and Hypertension. (opinion or narrative review)
- Hellwig et al., 2024. Dietary glycation compounds - implications for human health. (systematic review)
- Aljuraiban et al., 2024. The Role of Diet in the Prevention of Hypertension and Management of Blood Pressure: An Umbrella Review of Meta-Analyses of Interventional and Observational Studies. (systematic review)
- Bellis et al., 2019. Life course health consequences and associated annual costs of adverse childhood experiences across Europe and North America: a systematic review and meta-analysis. (pooled review (meta-analysis))
- Pieters et al., 2010. The effect of ethanol and its metabolism on fibrinolysis. (randomized trial)
- O'Malley et al., 2015. Acute alcohol consumption elevates serum bilirubin: an endogenous antioxidant. (randomized trial)
- Charoenwoodhipong et al., 2023. The Effect of Hokkaido Red Wines on Vascular Outcomes in Healthy Adult Men: A Pilot Study. (randomized trial)
- Schwarz et al., 2017. Red Wine Prevents the Acute Negative Vascular Effects of Smoking. (trial, not randomized)
- Eggertsen et al., 1993. Effect of coffee on ambulatory blood pressure in patients with treated hypertension. (randomized trial)
- Z'Graggen et al., 2010. Acute fluid ingestion in the treatment of orthostatic intolerance - important implications for daily practice. (trial, not randomized)
- Choleva et al., 2022. Effect of Moderate Wine Consumption on Oxidative Stress Markers in Coronary Heart Disease Patients. (randomized trial)
- Strychar et al., 1998. Impact of receiving blood cholesterol test results on dietary change. (randomized trial)
- Golan et al., 2017. Effects of initiating moderate wine intake on abdominal adipose tissue in adults with type 2 diabetes: a 2-year randomized controlled trial. (randomized trial)
- Lake et al., 2023. Hepatic steatosis and nonalcoholic fatty liver disease are common and associated with cardiometabolic risk in a primary prevention cohort of people with HIV. (population study: one-time survey)
- Trius-Soler et al., 2023. Effect of moderate beer consumption (with and without ethanol) on cardiovascular health in postmenopausal women. (trial, not randomized)
- Abel et al., 2012. [Effect of "Pintes" white wine on metabolic parameters in patients with metabolic syndrome]. (trial, not randomized)
- Trius-Soler et al., 2021. Moderate Consumption of Beer (with and without Ethanol) and Menopausal Symptoms: Results from a Parallel Clinical Trial in Postmenopausal Women. (trial, not randomized)
- Wotherspoon et al., 2020. Effect of Moderate Red Wine versus Vodka Consumption on Inflammatory Markers Related to Cardiovascular Disease Risk: A Randomized Crossover Study. (randomized trial)
- Nelson et al., 2008. Hypervolemia and blood alkalinity: effect on physiological strain in a warm environment. (randomized trial)
- Henrique de Moraes Cellia et al., 2022. Evaluation of cardiovascular risk biomarkers after moderate consumption of red wine and cachaça in a randomized crossover trial: The Wine and Cachaça Study (WICAS). (randomized trial)
- Emadi et al., 2025. Coffee's Impact on Health and Well-Being. (opinion or narrative review)
- Martínez-González et al., 2024. Effect of the Mediterranean diet in cardiovascular prevention. (opinion or narrative review)
- Riccardi et al., 2022. Dietary recommendations for prevention of atherosclerosis. (opinion or narrative review)
- Barbería-Latasa et al., 2025. The Mediterranean diet and cardiovascular disease. (opinion or narrative review)
- Windred et al., 2025. Light Exposure at Night and Cardiovascular Disease Incidence. (population study: followed a group)
- Lyu et al., 2024. Consumption of Total and Specific Alcoholic Beverages and Long-Term Risk of Gout Among Men and Women. (population study: followed a group)
- Renaud, 2001. Diet and stroke. (opinion or narrative review)
- Kazibwe et al., 2023. Association Between Alcohol Consumption and Ectopic Fat in the Multi-Ethnic Study of Atherosclerosis. (population study: one-time survey)
- Kwon et al., 2019. Effects of Moderate Alcohol Drinking in Patients with Nonalcoholic Fatty Liver Disease. (systematic review)
Words on this page
- Hazard ratio (HR)
- Compares how often something happened in two groups over time. 1 means no difference. 0.80 means 20% lower risk; 1.20 means 20% higher.
- Relative risk (RR)
- Compares the risk in two groups. 1 means no difference. 0.85 means 15% lower risk.
- Odds ratio (OR)
- Another way to compare two groups. 1 means no difference. Below 1 means lower odds, above 1 higher odds.
- 95% CI (confidence interval)
- The range where the true result likely lies. If the range includes no effect (1 for ratios, 0 for differences), the result is not clear.
- Pooled review (meta-analysis)
- A study that combines the results of many earlier studies to get one overall answer.
- Cohort study
- A study that follows a large group of people over years. It shows links, not causes.
- Gene study (Mendelian randomization)
- A study that uses natural gene differences between people as a kind of experiment.
- Diastolic pressure
- The bottom number in a blood pressure reading.
- Marker
- A lab or scan result that stands in for a health outcome. A better marker does not always mean better health.
How the short answer is set
Fixed rules turn the studies into the short answer, so the same studies always give the same answer. The rules start from GRADE, a standard system for rating evidence, in plain language.
| Confidence | What it means |
|---|---|
| High | We are confident the answer is right. |
| Moderate | The answer is probably right, but it could change. |
| Low | The answer may well change. |
| Very low (this page) | Any answer is very uncertain. |
| Not tested in people | Only cell or animal studies exist. |
Why very low here
- No trial has tested drinking against heart attacks, strokes or deaths.
- Evidence is population and gene studies, which show links, not proof.
- Population and gene studies point in opposite directions on benefit.
- Healthier habits among light drinkers may explain much of the apparent benefit.
Hard limit used. With no human trial of drinking and heart events, the answer cannot say moderate drinking protects the heart.
How this page was made
Label
- Search
- PubMed, Nov 14, 2026. Searches written by Claude Opus 5.5; papers ranked by PubMed
- First read of all 54 papers
- Claude Sonnet
- Independent second read
- Claude Haiku
- Disagreements settled by
- Claude Opus 5.5
- Page text written by
- Claude Opus 5.5
- Charts
- Drawn by code from the study records
- Source check by a person
- Not yet. Required before search engines may list this page.
- Expert review
- No
- Papers read in full
- 0 of 54; all from PubMed abstracts
- Method
- v0.2, created Nov 14, 2026
Search. We ran four PubMed searches for moderate alcohol drinking and heart disease and death: pooled and systematic reviews since 2012 (10 of 88), trials in people (22 of 190), population studies (22 of 990). The first number is how many papers we read; the second is how many PubMed found. We took the ones PubMed ranks as most relevant. See the full PubMed search. Of the 54 papers read, 21 were on topic.
Limits. Digestery reads at most about 60 papers per question, so large fields are sampled, not covered in full. Abstracts can leave out key details, such as side effects and funding.
Review queue
These items wait for a person. Search engines are asked not to list the page until the first one is done.
- OpenThe short answer is new. It waits for a source check by a person.
- OpenMartínez-González 2026 and Domínguez-López 2025 both analyze PREDIMED participants; overlapping people, not separate evidence.
- OpenMillwood 2023 and Millwood 2019 use the same China Kadoorie Biobank cohort; count once.
- OpenStake set to company for GlaxoSmithKline funding (Millwood 2023, Millwood 2019); a drug maker, not alcohol. Confirm rule intent.
- OpenNo abstract says non-drinkers include people who quit because of illness; only abstainer bias (Martínez-González 2026) and ex-drinker risk (Millwood 2023).
- OpenAjani 2000 and Djoussé 2009 are tagged RCT in PubMed but are observational analyses inside trials.
- OpenYe 2025 studies alcohol use diagnosis and drinking frequency, not moderate drinking, with heart rhythm outcome; kept relevant. Confirm.
- OpenSerio 2023 searched databases and selected 27 articles; may be systematic_review rather than narrative_review.
- OpenMartínez-González 2026 has wine-industry funding in grants but an empty COI field; ten relevant papers lack COI statements.
- OpenFuchs 2021 (off-topic blood pressure review) argues against heart benefit and cites drinker-abstainer differences; check whether to include.
Page history
| Date | Change | Reason |
|---|---|---|
| Nov 14, 2026 | Page created from 54 papers. | First version of the page. |
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