Can a Glass of Red Wine Replace Exercise? The Resveratrol Myth

Can Red Wine Replace Exercise? What the Resveratrol Study Found

No, a glass of red wine cannot replace an hour at the gym. The claim grew out of a 2012 University of Alberta study in which rats given large doses of resveratrol, a compound found in grape skins, gained more from their exercise training than rats that trained without it. The animals still exercised, the resveratrol was a purified supplement rather than wine, and the doses were enormous. The lead researcher later said that to get comparable amounts from wine you would need somewhere between 100 and 1,000 bottles a day.

The story is still worth understanding, because it shows how a careful animal experiment became a cheerful excuse to skip workouts, and because the questions behind it, about resveratrol, wine and health, come up again and again.

What the University of Alberta study actually did

The research was led by Jason Dyck, a cardiovascular scientist at the University of Alberta in Edmonton, and published in The Journal of Physiology in 2012. The team divided laboratory rats into two groups. Both followed the same programme of progressively harder treadmill training for 12 weeks. One group ate a normal diet; the other ate the same diet with resveratrol mixed in.

Training alone improved the rats’ endurance by around 21 percent. The resveratrol group did better still: their muscles produced more force, their hearts pumped more effectively and their heart muscle burned fat more efficiently. In other words, the supplement appeared to amplify the effects of exercise in rats that were already exercising.

Dyck’s interest was medical. He suggested the compound might one day help people who want to be active but physically cannot do much, such as some heart-failure patients, either by mimicking part of the training effect or by boosting the benefit of the little exercise they manage. That is a long way from telling healthy people to stay on the sofa.

From rat study to “wine instead of the gym”

When the findings were first announced in June 2012, the university described resveratrol as a possible natural performance enhancer shown in lab animals, and Dyck spoke of the prospect of “improved exercise performance in a pill”. The team’s next step was a planned human trial in patients with heart failure. Over the next few years, though, the story was retold on viral health sites with a new headline: a glass of red wine is as good as an hour of exercise. Each retelling dropped another detail, first that the subjects were rats, then that the compound was a supplement, then that the animals were training too.

By 2015 the University of Alberta’s medical faculty felt it had to respond. In a short article it explained that the study never suggested avoiding exercise and that, in Dyck’s words, “red wine is no excuse not to hit the gym, period.” He added that matching the study doses through wine would mean drinking “anywhere from 100 to 1,000 bottles per day”.

How much resveratrol is in a glass of wine?

Very little. Measurements vary with grape variety and winemaking, but red wine typically contains around 0.2 to 6 milligrams of resveratrol per litre, so a standard glass offers roughly a milligram at most. White wine has even less, because it is fermented without the grape skins.

The rats in the Alberta study received roughly 146 milligrams per kilogram of body weight each day. Sports scientist Asker Jeukendrup has worked through the arithmetic: scaled directly to a 70-kilogram person, that is about 10 grams a day. Even if you assume humans need ten times less than rats, you would still need about a gram, or roughly a thousand glasses of wine.

Your body also makes poor use of the resveratrol it does take in. Only a small fraction, often estimated at under one percent, reaches the bloodstream unchanged, because the liver and gut convert most of it quickly.

Other foods contain resveratrol too, including red grapes, blueberries, raspberries, peanuts and cocoa, but again in small amounts. They are good foods for many other reasons; a resveratrol dose is not one of them.

What human studies have found

Since 2012 researchers have tested resveratrol supplements in people, and the results have been disappointing for anyone hoping for an exercise pill:

A 2013 Danish trial, also published in The Journal of Physiology, gave older men either resveratrol or a placebo during eight weeks of exercise training. The men taking resveratrol gained less cardiovascular benefit from training than those on placebo.
A 2022 systematic review and meta-analysis of human trials on polyphenols and training adaptations found no significant benefit from resveratrol, and a hint of a slightly negative effect.
Broader reviews have found no high-quality evidence that resveratrol meaningfully prevents or treats any human disease, with only small or inconsistent effects on blood pressure, blood sugar and body weight.

High-dose supplements can also cause side effects such as nausea, stomach pain and diarrhoea. If you are thinking about taking resveratrol or any supplement, especially alongside medicines, talk to a doctor or pharmacist first.

Red wine and health: the bigger picture

The resveratrol headline rode on an older idea, the so-called French paradox: the observation that French people ate plenty of saturated fat yet had relatively low rates of heart disease, with red wine proposed as the explanation. Many early studies also suggested that moderate drinkers lived longer than non-drinkers.

Researchers now treat those findings with much more caution. One common problem is the comparison group: “non-drinkers” in older studies often included people who had stopped drinking because they were already ill, which made moderate drinkers look healthier by comparison. Better-designed analyses have shrunk or erased much of the apparent benefit.

Meanwhile the evidence on harm is firm. The International Agency for Research on Cancer classifies alcohol as a Group 1 carcinogen, the same category as tobacco smoke and asbestos, and it causes at least seven types of cancer, including bowel cancer and breast cancer. In 2023 the World Health Organization stated that no level of alcohol consumption is safe for health, and that there are no studies showing that possible heart or diabetes benefits outweigh the cancer risk for individual drinkers.

The older claims that a daily glass of wine prevents dementia or cancer, slows ageing or controls blood sugar are not supported by good evidence, and on cancer the evidence points the other way.

What this means for you

Exercise has no substitute in a bottle. Regular movement builds the heart, muscles and mitochondria in ways no supplement has been shown to copy. Even modest activity, such as brisk walking most days, brings real benefits.
If you enjoy wine, drink it for the pleasure, not as medicine, and keep the amount low. Less is safer.
If you cannot exercise because of illness or disability, ask your doctor or a physiotherapist about adapted activity; that is where the real help lies, not in resveratrol.
Check the subjects of a study. “Proven to” often turns out to mean “observed in rats”. A quick look at the original release usually tells you.

The Alberta study was a solid piece of laboratory science that asked an interesting question about people who cannot train. The viral version simply turned it upside down.

Sources: University of Alberta Faculty of Medicine & Dentistry, January 2015: Dyck on the resveratrol study and red wine; ScienceDaily, 20 June 2012: Resveratrol may be natural exercise performance enhancer; Asker Jeukendrup, mySportScience: A glass of wine or an hour of exercise?; Wikipedia: Resveratrol; World Health Organization, January 2023: No level of alcohol consumption is safe for our health.

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