Is Red Wine Good for Constipation?

Red wine contains a handful of compounds that can soften stools and nudge the gut along, but it falls far short of a reliable constipation remedy. One study found that moderate wine consumption softened stools in about 30 percent of healthy volunteers and roughly a fifth of people who already had constipation. That sounds promising until you consider the flip side: alcohol is a diuretic, certain wine components can irritate the gut lining, and the amounts involved are modest enough that you’d get more predictable relief from a glass of water and a few prunes. The relationship between red wine and your bowels is real but tangled, and the details matter more than the headline.

What the Evidence Says About Wine and Stool Consistency

The most direct piece of research people point to when asking this question comes from a study by Müller-Lissner and colleagues, which looked at how moderate beer and wine intake affected stool characteristics. Among healthy subjects, about 30 percent experienced softer stools with moderate wine consumption. Among people who already had constipation, about 21 percent saw the same effect. Even a small group of people with irritable bowel syndrome with constipation showed some stool softening, though the proportion was lower at around 8 percent.¹

Those numbers are worth putting in context. A 30 percent response rate in healthy people is not nothing, but it also means 70 percent of people didn’t notice a difference. For people who were already constipated, the benefit was even less consistent. This isn’t the kind of evidence that would lead a gastroenterologist to recommend red wine as a treatment. It does suggest that something in wine has a genuine, if modest, effect on stool consistency, which leads to the obvious next question: what exactly is doing the work?

How Alcohol Concentration Shapes Gut Movement

The alcohol itself plays a role, but in a counterintuitive way. The effect depends heavily on how much alcohol is in the drink. Low-alcohol beverages like wine and beer tend to speed up gastric emptying, meaning the stomach pushes its contents into the small intestine faster than it otherwise would.² High-alcohol drinks, those above roughly 15 percent, do the opposite: they slow the stomach down and can actually inhibit bowel motility.³

Red wine typically sits around 12 to 15 percent alcohol by volume, which places it right in the zone where the gastric-emptying effect is favorable. But there’s a wrinkle. The pattern flips depending on whether you’re talking about a single drink or regular heavy consumption. A single dose of alcohol tends to slow small bowel transit, while chronic heavy drinking speeds it up.² So the person who has one glass of red wine with dinner is experiencing a somewhat different physiological picture than someone drinking heavily every night. For the occasional or moderate drinker, the stomach may empty faster, but the downstream journey through the intestines doesn’t necessarily speed up to match.

This is why the “alcohol helps me go” experience is inconsistent. The motility effects depend on the concentration, the frequency, and even the individual’s baseline gut speed. If your constipation is caused by slow colonic transit, accelerating stomach emptying alone won’t solve the problem.

Polyphenols and the Gut Microbiome

Red wine’s most interesting angle for gut health has nothing to do with alcohol and everything to do with polyphenols, the plant compounds responsible for the wine’s color, astringency, and much of its flavor. Red wine is unusually rich in these compounds compared to other alcoholic beverages, because the grape skins and seeds are in contact with the juice for a longer period during fermentation.

A study across three large independent cohorts found that red wine consumption was positively associated with greater diversity in the gut microbiome. The association showed up in a dose-dependent pattern, meaning more frequent red wine drinkers tended to have more diverse gut bacteria. But even infrequent red wine consumption showed a measurable effect. White wine showed a smaller, less definitive association, and other types of alcohol showed none at all.⁴ The researchers attributed this difference to polyphenols rather than alcohol itself, since other alcoholic beverages didn’t produce the same result.

A systematic review of the broader research on grape and red wine polyphenols reached a similar conclusion: these compounds can shift the composition of gut bacteria in ways that tend to favor beneficial species.⁵ The relationship appears to go both directions. Gut bacteria help break down polyphenols into smaller metabolites, and those metabolites in turn influence which bacteria thrive. This two-way interaction means the same glass of wine might have somewhat different microbiome effects in different people, depending on which bacteria they started with.

Why does microbiome diversity matter for constipation? A more diverse microbial community tends to produce a wider range of short-chain fatty acids, which help regulate water absorption in the colon and support the rhythmic contractions that move things along. People with chronic constipation frequently have lower microbiome diversity. So in theory, anything that broadens the microbial population could help restore more normal bowel function over time. But this is a slow, indirect pathway. Drinking red wine tonight won’t reshuffle your microbiome by tomorrow morning.

A Surprising Source of Soluble Fiber

One of the more overlooked facts about red wine is that it contains measurable amounts of soluble dietary fiber, contributed by grape cell walls during fermentation. Red wine ranges from about 0.94 to 1.37 grams of soluble fiber per liter, while white wine contains far less, around 0.19 to 0.39 grams per liter.⁶

To be clear, this is not a large amount. A standard glass of red wine is about 150 milliliters, which translates to roughly 0.14 to 0.21 grams of fiber. You’d get more soluble fiber from a single apple or a tablespoon of chia seeds. But it’s more than zero, and soluble fiber is the specific type that softens stools by absorbing water in the intestines. It’s a minor contributor, but it may help explain why wine appears to soften stools slightly in some studies while spirits do not. The polyphenols and the fiber likely work together here, which is part of why red wine keeps showing up in gut-health research while vodka does not.

Anti-Inflammatory Effects on the Gut Lining

Beyond the microbiome, there’s laboratory evidence that the polyphenol fraction of red wine (separated from the alcohol) can protect intestinal cells from inflammation. In cell culture experiments, a non-alcoholic red wine polyphenol extract reduced inflammatory signaling in gut epithelial cells and boosted the cell’s own antioxidant defenses, including by increasing production of glutathione, a key protective molecule that gets depleted during inflammation.⁷

This finding is genuinely interesting, but it comes with an important caveat: the protective compound was a polyphenol extract, not actual wine. The alcohol in wine does the opposite of what the polyphenols do. Ethanol irritates the gut lining and can increase permeability, the degree to which the intestinal barrier lets substances pass through. So when you drink actual red wine, you’re getting an anti-inflammatory package alongside a pro-inflammatory solvent. Whether the net effect on your gut lining is positive or negative depends on how much you drink, how healthy your gut is to begin with, and your individual sensitivity.

When Red Wine Could Make Constipation Worse

There are several scenarios where red wine is more likely to aggravate constipation than relieve it. The most obvious is dehydration. Alcohol is a diuretic, meaning it increases urine output and draws water away from the colon. Stools need adequate water content to remain soft and easy to pass. If you drink wine without enough water alongside it, or if you’re already mildly dehydrated, the net effect on stool consistency could easily go in the wrong direction. This is the most common way people experience a worsening of constipation after drinking.

People with inflammatory bowel disease face a specific risk. A study of patients with inactive Crohn’s disease and ulcerative colitis found that daily moderate red wine consumption significantly increased intestinal permeability, a key marker of gut barrier dysfunction that can precede disease flares. The researchers concluded that patients with inactive IBD who drink red wine daily may face an increased long-term risk of relapse.⁸ If you have IBD and constipation is one of your symptoms, red wine is not a safe home remedy.

Histamine and other biogenic amines in red wine are another concern. Red wine is a common trigger for people with histamine intolerance or diamine oxidase deficiency. Reactions can include bloating, abdominal cramps, and disrupted bowel function.⁹ White wine, by contrast, tends to cause intolerance through its sulfite content rather than histamine. If you find that red wine makes your stomach feel worse rather than better, histamine intolerance is a plausible explanation, and it’s more common than most people realize.

Why Red Wine Is Not a Constipation Treatment

If you add up the evidence, red wine contains at least four things that could plausibly help with constipation: low-concentration alcohol that speeds gastric emptying, polyphenols that diversify the gut microbiome, small amounts of soluble fiber, and anti-inflammatory compounds that protect intestinal cells. But each of these operates modestly and indirectly. The stool-softening effect documented in research only appeared in a minority of participants. The microbiome changes happen slowly. The fiber content per glass is negligible. And the anti-inflammatory benefits are partly canceled out by alcohol’s own damage to the gut lining.

Compare this to approaches that actually have strong evidence behind them. Adequate water intake, dietary fiber from whole foods, physical activity, and over-the-counter osmotic laxatives all address constipation more reliably and with far less risk. If you already enjoy a glass of red wine with dinner and find it helps your digestion, the science suggests you’re probably not imagining things. But if you don’t currently drink wine, starting for the sake of your bowels would be trading a minor, unreliable benefit for the real risks that come with regular alcohol consumption.

Red Wine Versus White Wine for Gut Effects

When people ask about wine and constipation, they almost always mean red wine, and the evidence supports a genuine distinction between the two. Red wine consistently outperforms white wine on three of the relevant metrics. It contains roughly three to four times as much soluble fiber per liter.⁶ Its association with gut microbiome diversity is stronger and more consistent across studies.⁴ And its polyphenol content is substantially higher, because the extended skin contact during red wine production extracts far more of these compounds.

White wine is not worthless, but whatever gut-related benefits it offers are diluted. The microbiome studies found only a suggestive association between white wine and microbial diversity, not the clear dose-dependent relationship seen with red wine. Both contain alcohol at similar concentrations, so the gastric-emptying effect would be comparable. But the polyphenol-driven effects, which appear to be the more meaningful pathway, are much weaker in white wine. If someone is choosing between the two specifically for digestive comfort, red wine has the stronger case.

The Dealcoholized Wine Question

Given that the polyphenols seem more important than the alcohol for gut health, a natural question is whether dealcoholized red wine would give you the benefits without the downsides. The cell culture research on red wine’s anti-inflammatory properties actually used a non-alcoholic polyphenol extract and found robust protective effects on intestinal cells.⁷ This suggests the polyphenols work independently of alcohol. Dealcoholized red wine retains most of the original polyphenol content while eliminating the dehydrating, gut-irritating, and permeability-increasing effects of ethanol.

For someone specifically interested in red wine’s microbiome and anti-inflammatory properties without wanting the alcohol, dealcoholized red wine or even concentrated grape polyphenol supplements are options worth considering. They sidestep the dehydration issue entirely. You also avoid the histamine and biogenic amine concentrations that bother some people, since these compounds are present regardless of alcohol content, though you at least eliminate the compounding effect of ethanol on gut permeability. The research on dealcoholized wine’s digestive effects in humans is thinner than on regular wine, but the mechanistic logic is sound.

What Actually Helps if You Are Constipated

If you landed here looking for a practical answer to an uncomfortable problem, here is what the broader gastroenterology evidence supports as first-line approaches:

• Water: Dehydration is the single most common modifiable contributor to hard stools. Drinking enough fluid throughout the day does more for stool consistency than any single food or beverage.
• Soluble fiber: Foods like oats, beans, flaxseed, and fruits provide grams of soluble fiber per serving, dwarfing the trace amounts in wine. Psyllium husk is a concentrated supplement option with strong evidence.
• Physical activity: Regular movement stimulates the wave-like contractions of the colon. Even daily walking helps.
• Osmotic laxatives: Products containing polyethylene glycol or magnesium citrate draw water into the bowel and are well-studied for occasional constipation.

Red wine fits somewhere in the background of digestive life. If you enjoy it in moderation and notice it helps, there are real mechanisms behind that experience. But reaching for a corkscrew as a constipation strategy puts you on shaky ground when simpler, better-supported options are available.