Myth or fact

A glass of red wine a day is good for your heart

Short answerNo

By GyroscopeUpdated November 15, 20267 sources

No. Light drinkers looked healthier in the old studies mostly because of how they lived. When researchers used the genes of 371,463 people to test the drink itself, light drinking nudged heart risk up a little and heavier drinking raised it faster and faster. Nothing shows red wine is special.

Why do so many people believe it?

For years the headlines came from studies that followed people and compared drinkers with non-drinkers. Light drinkers often came out ahead on heart disease. Red wine got extra credit, because it carries plant compounds like resveratrol that sound like they should protect you.

The trouble is who light drinkers are. Judging wine by wine drinkers’ health is like judging a car by its owners’ driving records. Careful people tend to pick certain cars, and the car isn’t what makes them careful.

What did the genetic study find?

A 2022 study used the UK Biobank, 371,463 adults with an average age of 57, to test this two ways.

First, the ordinary way. Light and moderate drinkers did have fewer heart problems, but they also had healthier lifestyles in general. When the researchers adjusted for those, the heart benefit of light drinking shrank.

Second, the genetic way. Some people are born with gene variants that nudge them to drink a bit more or less, and those variants are handed out at conception, before anyone picks a lifestyle. That makes them a kind of natural experiment. People whose genes predicted more drinking had 1.3 times the risk of high blood pressure and 1.4 times the risk of coronary artery disease for each standard step up in predicted drinking. When the researchers looked at the shape of the curve, light drinking came with a small rise in risk and heavier drinking with a risk that climbed faster and faster.

Their conclusion was that alcohol at all amounts went with higher heart risk, with big differences between light and heavy drinking.

Is red wine different from other drinks?

Nothing we found shows it is. The National Academies’ 2024 review, the one that found the strongest case for moderate drinking, says outright that it “does not compare health outcomes across different types of alcohol.” The National Cancer Institute says studies found no link between moderate red wine drinking and a lower risk of prostate or colorectal cancer, and a review found no difference between red and white wine for overall cancer risk.

A glass of red is also often bigger than people think. A 6 oz pour of 13.5% red wine is 1.35 US drinks, so “a glass a day” is closer to nine and a half drinks a week.

What does a glass do to your heart tonight?

Your heart works harder on a drinking night. In a 2021 sleep lab study of 26 adults aged 30 to 60, a drink or two before bed raised heart rate through the night and lowered HRV, and a higher dose did more. In women, the higher dose also raised systolic blood pressure in the morning. What your watch or ring sees has the bigger studies, and bloodpressure.guide covers blood pressure.

The best case for it

The strongest case comes from the National Academies, asked by Congress to review the evidence for the new US guidelines. In December 2024 it concluded, with moderate certainty, that moderate drinkers (up to two drinks a day for men and one for women) had lower deaths from heart disease than people who never drank. It found lower non-fatal heart attacks and strokes with low certainty.

That’s a real finding from a careful group, and it’s fair to say scientists still disagree. But it rests on the same kind of studies that follow drinkers and non-drinkers, and a 2023 review found that 86 of 107 such studies mixed former or occasional drinkers into the non-drinker group. The genetic studies, which get around that problem, lean the other way. In January 2026, the 2025-2030 US Dietary Guidelines dropped their daily limit and now say “Consume less alcohol for better overall health.”

We think the evidence for a daily glass protecting your heart is weak, the evidence that more alcohol raises heart risk is strong, and the evidence that red wine is special is missing.

Is red wine healthy? has the pros and cons in short, and your heart covers what alcohol does to heart rhythm and blood pressure.