In this article
- Does beer contain fiber? Two different answers
- Where the fiber in beer comes from
- Most of the barley fiber stays at the brewery
- A pint versus a bowl of barley
- What a can of beer does carry
- What about nonalcoholic beer?
- Beer and your gut bacteria
- Getting barley’s fiber without the brewery
- A quick rule for beer and fiber
- Where beer fiber research is heading
- Beer and fiber: what people ask
- Sources
Does beer contain fiber? USDA’s nutrient database says no, listing regular beer at 0 grams. Brewing scientists who measure it directly find a small amount anyway, between 0.5 and 4.0 grams per liter of dissolved barley fiber in both regular and nonalcoholic beer.
That works out to roughly 0.2 to 1.4 grams in a 12-ounce can. It’s real fiber, but it’s a crumb compared with the grain the beer was brewed from.
Does beer contain fiber? Two different answers
The gap comes down to what’s being measured. USDA’s records report standard nutrients per 100 grams, and for beer the fiber line reads zero.
A 2024 review in Critical Reviews in Food Science and Nutrition pulled together lab measurements aimed specifically at non-starch polysaccharides (NSPs), the cell wall carbohydrates that make up a major group of dietary fiber. Those studies found NSPs in every type of beer they examined.
| Drink, 12 fl oz (about 355 ml) | Fiber in USDA’s table | Fiber measured as NSPs | Calories (USDA) |
|---|---|---|---|
| Regular beer | 0 g | about 0.2 to 1.4 g | about 153 |
| Nonalcoholic beer or malt beverage | 0 g | about 0.2 to 1.4 g | about 131 |
The NSP column is converted from the review’s 0.5 to 4.0 grams per liter range. The calorie figures are worked out from USDA’s per 100 gram values.
Even at the top of that range, a can holds less than a gram and a half. For practical purposes, count beer as a zero.
Where the fiber in beer comes from
Beer starts with malted barley, and barley grains are wrapped in fibrous cell walls. Two of the main fibers in those walls are arabinoxylans (chains of two plant sugars, arabinose and xylose) and beta-glucans, the gel-forming fiber that barley and oats are known for.
According to the 2024 review, these two make up most of the NSPs in finished beer. The brewing steps decide how much survives.
- Malting: the grain sprouts and its own enzymes start breaking down cell walls.
- Wort production: hot water pulls sugars and some soluble fiber out of the crushed malt.
- Filtration: the beer is cleared, and part of the dissolved fiber is removed with the haze.
The review notes that each of these steps has a significant effect on the soluble NSP content of the final beer. That’s one reason measured values cover such a wide range.
Body and haze tell part of the story
NSPs aren’t just a nutrition footnote for brewers. The review links them strongly to a beer’s viscosity, the thicker feel on your tongue, and to its turbidity, or cloudiness.
That makes sense of the haze in some unfiltered styles. It doesn’t turn them into drinks with fiber worth counting, but a hazy, full-bodied beer has likely kept more of these polysaccharides than a crystal-clear one.
Why barley’s fiber is worth chasing
Beta-glucan is a soluble fiber, the type that dissolves in water and forms a gel in your gut. Mayo Clinic notes that soluble fiber can help lower blood cholesterol and glucose levels, and it lists barley among the foods that supply it.
Those benefits depend on eating a real dose. The fraction of a gram that slips through brewing into a can is far too small to produce the effects seen with oats or barley in the bowl.
Most of the barley fiber stays at the brewery
If beer holds so little fiber, where does the rest go? Most of it is left behind in the mash tun as brewers’ spent grain, the soggy husks and grain solids strained out before the liquid is boiled.
A 2016 review in the Journal of the Institute of Brewing calls spent grain the most abundant by-product of brewing and describes it as rich in fiber and protein. Today it mostly goes to animal feed.
Researchers are interested in using it to fortify foods for people because it’s cheap and widely available. In a sense, the fiber you might hope to find in a pint ends up in the cattle trough instead.
A pint versus a bowl of barley
The cleanest comparison is the grain itself. USDA lists one cup of cooked pearled barley at 6.0 grams of fiber and 193 calories.
| Barley in different forms | Serving | Fiber | Calories |
|---|---|---|---|
| Cooked pearled barley | 1 cup (157 g) | 6.0 g | 193 |
| Regular beer, lab NSP range | 12 fl oz | about 0.2 to 1.4 g | about 153 |
| Regular beer, USDA table | 12 fl oz | 0 g | about 153 |
At the very best, a can of beer delivers under a quarter of the fiber in a cup of barley for a similar number of calories. At the low end of the range, you’d need more than 30 cans to match one bowl.
Mayo Clinic suggests about 25 grams of fiber a day for women and 38 grams for men aged 50 or younger. Beer won’t move you meaningfully toward either target.
Not sure what your own target is? Our fiber calculator works out a personal daily number in seconds.
What a can of beer does carry
Beer isn’t nutritionally empty, even without fiber. Scaled from USDA’s per 100 gram values, a 12-ounce regular beer supplies about 1.8 mg of niacin, 21 micrograms of folate, 96 mg of potassium and 21 mg of magnesium, along with about 1.6 grams of protein.
| Per 12 fl oz (USDA, scaled) | Regular beer | Nonalcoholic malt beverage |
|---|---|---|
| Fiber | 0 g | 0 g |
| Niacin | 1.8 mg | 3.9 mg |
| Folate | 21 mcg | 50 mcg |
| Potassium | 96 mg | 28 mg |
| Magnesium | 21 mg | 25 mg |
Those are small amounts compared with what a serving of whole grains, beans or leafy greens provides. They also come with alcohol in regular beer and with plenty of sugar in malt beverages, so beer works poorly as a vitamin source too.
What about nonalcoholic beer?
Nonalcoholic beer is brewed from the same malted grain, and the 2024 review found its NSP content falls in the same 0.5 to 4.0 grams per liter range as regular beer.
USDA’s closest record, “malt beverage, includes non-alcoholic beer,” lists 0 grams of fiber. Per 12 ounces, it works out to about 131 calories and 28.6 grams of sugar, because that category includes sweet malt drinks as well as dealcoholized beer.
Labels vary widely across nonalcoholic brands, so the nutrition panel on the can you’re holding is the better guide. What’s consistent is that none of them is a fiber source.
Beer and your gut bacteria
A small Portuguese trial tested whether beer itself changes the gut microbiota, the community of bacteria living in your intestines. Twenty-two healthy men drank one 330 ml bottle of lager a day for four weeks, either regular at 5.2% alcohol or alcohol-free, and 19 finished the study.
Bacterial diversity rose in both groups, with no difference between them, and neither group gained weight or body fat. The authors pointed to polyphenols, plant compounds from hops and malt, as a possible reason, rather than fiber.
With fewer than a dozen men finishing in each group and only four weeks of drinking, the trial is an interesting early signal. It isn’t a case for a nightly beer.
If you’re working on your gut health from the fiber side, our gut health guides walk you through building up foods your bacteria actually feed on.
Getting barley’s fiber without the brewery
If the appeal is barley itself, eat the grain. Cooked pearled barley works in soups, grain bowls and salads, and every cup brings the 6 grams a can of beer can’t.
Other drinks with fiber worth considering are the ones that keep the whole plant: smoothies made from whole fruit, or a glass of water alongside a high-fiber snack.
Looking for barley soups, grain salads and other easy ways to get more whole grains? Our recipe eBooks are full of them.
A quick rule for beer and fiber
- If you’re tracking fiber: log beer as 0 grams, whatever the style.
- If you’re choosing between regular and nonalcoholic: the fiber is about the same, so decide on alcohol and sugar instead.
- If you want barley’s fiber: eat the grain; a cup of cooked barley gives you 6 grams.
- If gut health is your goal: get your fiber from whole grains, beans and fruit, since the one beer trial pointed to polyphenols rather than fiber and was too small to act on.
Where beer fiber research is heading
The more interesting work isn’t about beer as a fiber source at all. The 2024 review’s authors stress that NSPs in alcoholic beer don’t make it something to drink for nutrition, but they suggest that what’s known about these fibers in brewing applies largely to nonalcoholic beer too.
That opens a question for future research: whether nonalcoholic brews could be designed to keep more of barley’s beta-glucans and arabinoxylans. Meanwhile, the bigger fiber story may come from the other end of the brewery, as spent grain moves from animal feed into foods for people.
For now, the numbers are clear enough to act on. Beer has a trace of barley fiber, and the grain it came from has far more.
Beer and fiber: what people ask
Is there any fiber in beer?
A little. Lab studies find 0.5 to 4.0 grams per liter of dissolved barley fiber in beer, about 0.2 to 1.4 grams per 12-ounce can, but USDA’s table lists it as 0 grams.
Does dark beer have more fiber than light beer?
There’s no good evidence that color predicts fiber. Malting, wort production and filtration have the biggest effect on how much dissolved fiber ends up in the glass.
Do unfiltered or hazy beers have more fiber?
Possibly a bit more. Research links a beer’s cloudiness and body to its non-starch polysaccharide content, and filtration lowers it, but even hazy beers aren’t a meaningful fiber source.
Does nonalcoholic beer have fiber?
Only a trace, in the same range as regular beer. USDA lists nonalcoholic malt beverages at 0 grams of fiber.
Where does the fiber in barley go when beer is made?
Most of it stays in the brewers’ spent grain, the solids strained out of the mash. That by-product is rich in fiber and protein and mostly becomes animal feed.
Is beer good for gut bacteria?
One small 4-week trial found gut bacterial diversity rose in men who drank a lager a day, with or without alcohol. The study was too small to recommend beer for gut health.
What drinks actually have fiber?
Drinks that keep the whole plant, such as smoothies made from whole fruit, are the best bets. Beer, wine, spirits and most juices have little or none.
Sources
- U.S. Department of Agriculture, Agricultural Research Service. “FoodData Central” (beer; malt beverage, includes non-alcoholic beer; barley, pearled, cooked). 2026. fdc.nal.usda.gov
- Reid JES, Yakubov GE, Lawrence SJ. “Non-starch polysaccharides in beer and brewing: A review of their occurrence and significance.” Critical Reviews in Food Science and Nutrition. 2024. nottingham-repository.worktribe.com
- Lynch KM, Steffen EJ, Arendt EK. “Brewers’ spent grain: a review with an emphasis on food and health.” Journal of the Institute of Brewing. 2016. research.ucc.ie
- Marques C, Dinis L, Barreiros Mota I, et al. “Impact of Beer and Nonalcoholic Beer Consumption on the Gut Microbiota: A Randomized, Double-Blind, Controlled Trial.” Journal of Agricultural and Food Chemistry. 2022. pmc.ncbi.nlm.nih.gov
- Mayo Clinic Staff. “Dietary fiber: Essential for a healthy diet.” Mayo Clinic. 2024. mayoclinic.org
