Is it the alcohol or the grape compounds that help the heart?
The heart benefits linked to red wine appear to come from its polyphenols—bioactive compounds like phenolic acids—not the alcohol itself. A 2022 randomized trial in 64 coronary heart disease patients found that those who drank 27 grams of alcohol per day as red wine for 8 weeks had decreased markers of oxidative damage (oxidized guanine and protein carbonyls), while those who drank the same amount of pure ethanol had increased damage [3]. This suggests wine's polyphenols counteract the oxidative stress caused by alcohol.
A 2024 longitudinal study of 217 participants from the PREDIMED trial used urinary tartaric acid (a reliable biomarker of wine consumption) and found that higher wine intake over one year was linked to significant reductions in inflammatory markers like sVCAM-1 and sICAM-1, which are involved in atherosclerosis [4]. For example, participants with the greatest increase in tartaric acid saw a 0.31 ng/mL drop in sICAM-1 compared to those with the smallest increase [4]. This anti-inflammatory effect is likely driven by polyphenols, not ethanol.
Does moderate drinking really lower heart risk, or is it just healthier people?
Many studies report a 'J-shaped' curve, where light to moderate drinkers have lower heart disease risk than both heavy drinkers and non-drinkers. A 2025 analysis of over 400,000 UK Biobank participants found this pattern for heart failure in both men and women [1]. However, the authors caution that light drinkers often have higher socioeconomic status and healthier lifestyles, which could explain the apparent benefit—a phenomenon called confounding [1]. When former drinkers are misclassified as non-drinkers, it can also skew results [1].
A 2023 survey of 184 doctors in Spain found that 59% recommended zero alcohol consumption for heart health, and only 20% said a daily drink could be healthy for non-drinkers [5]. This reflects growing skepticism among experts about the net benefit of alcohol, even in moderate amounts. The 2025 commentary also notes that even modest alcohol intake is clearly linked to atrial fibrillation, a heart rhythm disorder, which could offset any potential benefits [1].
So, should I start drinking red wine for my heart?
The evidence does not support starting to drink red wine solely for heart health. A 2023 systematic review of 74 studies found no negative outcomes from moderate red wine consumption (1 glass/day for women, 2 for men) and consistent benefits for mortality and dementia [2]. However, the same review notes that 36% of the studies evaluated cancer outcomes, and the overall risk-benefit balance is uncertain [2]. A 2022 study on Croatian wines found that 200 mL per day for six weeks improved blood pressure and cholesterol in healthy adults, but liver enzymes did not increase, suggesting short-term safety [6].
The bottom line: if you already drink moderately, there's no strong evidence to stop, but if you don't drink, the potential heart benefits are small and may be outweighed by risks like cancer and liver disease. The 2025 commentary emphasizes that even low-dose alcohol can contribute to weight gain and fatty liver disease, especially in overweight individuals [1]. A healthier approach is to focus on the polyphenol-rich foods in a Mediterranean diet, like grapes, berries, and dark chocolate, without the alcohol.
Sources used in this answer
Alcohol and Heart Failure: A Complex Relationship!
A 2025 commentary on a UK Biobank study (407,014 participants) found a J-shaped association between alcohol consumption and heart failure risk, but beer drinkers, especially women, had higher risk, and the authors caution that confounding by lifestyle factors may explain apparent benefits [1].
Long-Term Health Outcomes of Regular, Moderate Red Wine Consumption
A 2023 systematic review of 74 studies found no negative health outcomes associated with moderate red wine consumption, with consistent benefits for mortality and dementia, and neutral or beneficial effects on cancer and cardiovascular conditions [3].
Effect of Moderate Wine Consumption on Oxidative Stress Markers in Coronary Heart Disease Patients
A 2022 randomized trial in 64 coronary heart disease patients found that 8 weeks of moderate red wine consumption decreased markers of oxidative damage (oxidized guanine and protein carbonyls), while pure ethanol increased them, suggesting wine polyphenols counteract alcohol-induced oxidative stress [4].
Moderate wine consumption measured using the biomarker urinary tartaric acid concentration decreases inflammatory mediators related to atherosclerosis
A 2024 longitudinal study of 217 PREDIMED trial participants found that higher wine consumption (measured by urinary tartaric acid) over one year was associated with significant reductions in inflammatory markers sVCAM-1 and sICAM-1, indicating anti-inflammatory effects [5].
Doctors' perception of red wine consumption and cardiovascular health.
A 2023 survey of 184 doctors in Spain found that 59% recommended zero alcohol consumption for heart health, and only 20% thought a daily drink could be healthy for non-drinkers, reflecting expert skepticism [6].
Bioactive Compounds and Antioxidant Activity of Red and White Wines Produced from Autochthonous Croatian Varieties: Effect of Moderate Consumption on Human Health
A 2022 study on Croatian wines found that 200 mL per day for six weeks in 66 healthy adults decreased systolic and diastolic blood pressure, total cholesterol, and LDL, while increasing HDL, serotonin, and dopamine, without significantly raising liver enzymes [7].