Pearl barley is not a whole grain. It’s technically a refined grain because the pearling process removes some or all of the outer bran layer along with the inedible hull. That said, pearl barley is significantly more nutritious than most refined grains, and the distinction matters less than you might think.
What Pearling Actually Removes
A barley kernel has four basic layers: the outer hull (about 13% of the grain’s weight), the bran and outer coatings (roughly 9%), the starchy endosperm (77%), and the germ (3%). To qualify as a whole grain, barley needs to keep its bran and germ intact, with only the tough, inedible hull removed.
Pearling goes further. The process uses a stone mill to gradually grind away the hull, bran, and germ through multiple rounds of polishing. The degree of pearling varies. Lightly pearled barley still looks tan and retains some bran. Heavily pearled barley is noticeably white, with most of the bran stripped away. The Whole Grains Council explicitly labels pearl barley as “not a whole grain,” and products made from it don’t qualify for whole grain stamps on packaging.
Why Pearl Barley Is Still Nutritious
Here’s where barley breaks the usual rules about refined grains. Unlike wheat or rice, where nearly all the fiber sits in the outer bran layer, barley’s fiber is distributed throughout the entire kernel. This means even heavily pearled barley retains a meaningful amount of fiber. A quarter cup of whole grain barley provides about 8 grams of fiber, and pearl barley, while lower, still delivers considerably more fiber than white rice or refined wheat products.
The fiber that makes barley special is beta-glucan, a soluble fiber concentrated at about 4 to 5 grams per 100 grams in conventional varieties. Because beta-glucan isn’t confined to the bran, pearling doesn’t strip it out the way you’d expect. A meta-analysis of eight clinical trials found that barley consumption lowered total cholesterol by about 13 mg/dL, LDL (“bad”) cholesterol by 10 mg/dL, and triglycerides by 12 mg/dL. Several of those trials specifically used pearled barley. The FDA recognizes that 3 or more grams of beta-glucan daily from whole oats or barley can reduce heart disease risk.
Pearl Barley vs. Hulled Barley
If you want the full whole grain version, look for hulled barley (also called dehulled barley) or hulless barley. Hulled barley has only the inedible outer hull removed, preserving all the bran and germ. Hulless barley is a variety where the hull is so loosely attached it falls off during harvest, keeping all nutritious layers intact.
The tradeoff is cooking time. Pearl barley cooks in 25 to 30 minutes with a 3:1 water-to-grain ratio. Hulled barley takes 45 minutes to an hour, even with a few hours of pre-soaking (which can shave the time down to about 35 to 40 minutes). Pearl barley also has a softer, less chewy texture, which is why it became the default in soups and stews.
Most barley on supermarket shelves is pearl barley. You’ll typically need to visit a health food store or buy online to find hulled or hulless varieties.
Where Pot Barley Fits In
You may also see “pot barley” or “Scotch barley.” This is an in-between product: it goes through only the first stage of pearling, so it still has most of its bran intact. Pot barley isn’t quite a whole grain, but it’s closer to one than standard pearl barley. It cooks faster than hulled barley but retains more nutrients than the fully pearled version.
Blood Sugar and Glycemic Impact
Barley in general has a low glycemic index compared to most grains. Whole grain barley cultivars tested in clinical studies showed GI values ranging from 21 to 36, which is remarkably low (pure glucose is 100, and white bread is around 75). Pearled barley scores higher, but the difference isn’t always dramatic. In one study, the GI jumped from 26 for whole grain barley to 53 for the pearled version of the same cultivar. Both values still fall in the low-to-medium GI range, making even pearl barley a better choice for blood sugar management than white rice or most bread.
The beta-glucan fiber is largely responsible for this effect. It forms a gel-like substance during digestion that slows the absorption of sugars into the bloodstream.
The Bottom Line on Choosing Barley
Pearl barley is a refined grain by definition, but calling it “refined” puts it in the same category as white flour and white rice, which is misleading. Its unique fiber distribution means it retains health benefits that other refined grains lose entirely. If you’re specifically trying to maximize whole grain intake, switch to hulled or hulless barley and budget the extra cooking time. If pearl barley is what’s available and convenient, it’s still one of the most fiber-rich, heart-healthy grains you can eat.