Health benefits of Barley

Barley has been cultivated for over 10,000 years — and modern nutrition science keeps finding new reasons that longevity makes sense. It is one of the richest dietary sources of beta-glucan, a soluble fibre with well-documented benefits for heart health, blood sugar regulation, and gut microbiome diversity. At Spent Goods, our artisan breads and crackers are made with upcycled spent brewery barley — meaning you get the nutritional benefits of whole grain barley in every bite, while diverting food waste from landfill.

Barley Nutrition at a Glance

Per 100g of cooked pearl barley, you get a nutrient profile that outperforms most common grains on fibre, mineral density, and satiety:

Nutrient	Per 100g cooked	% Daily Value	Key benefit
Calories	123 kcal	—	Lower than white rice
Dietary Fibre	3.8g	14%	Gut health, satiety
Beta-glucan	~2–3g	—	Cholesterol & blood sugar
Protein	2.3g	5%	Muscle repair
Selenium	13.5mcg	25%	Thyroid, antioxidant defence
Manganese	0.27mg	12%	Bone health, metabolism
Phosphorus	54mg	8%	Energy production
Magnesium	22mg	5%	Nerve & muscle function
B Vitamins (B1, B3, B6)	Moderate	5–10%	Energy metabolism

Beta-Glucan: The Standout Compound

Barley contains more beta-glucan than almost any other whole grain — including oats, which are more commonly marketed for this benefit. Beta-glucan is a viscous soluble fibre that forms a gel in the digestive tract. This gel slows glucose absorption and binds to bile acids (which the body synthesises from cholesterol), triggering the liver to draw more cholesterol from the bloodstream to replace them — resulting in measurably lower LDL levels.^[1]

The evidence base is substantial. A 2016 systematic review and meta-analysis of 14 randomised controlled trials published in the European Journal of Clinical Nutrition found that a median dose of 6.5g/day of barley beta-glucan significantly reduced LDL cholesterol by 0.25 mmol/l and non-HDL cholesterol by 0.31 mmol/l compared to control diets.^[1] An earlier meta-analysis of 11 randomised trials reached similar conclusions, reporting reductions of 0.30 mmol/l in total cholesterol and 0.27 mmol/l in LDL.^[2]

Both Health Canada and the European Food Safety Authority (EFSA) permit health claims linking barley beta-glucan to reduced risk of coronary heart disease — one of only a handful of food ingredients to receive this regulatory designation on both sides of the Atlantic.^[3][4]

How much beta-glucan do you need?

The threshold for clinically meaningful cholesterol reduction is 3g of beta-glucan per day — the amount specified in both the Health Canada and EFSA approved claims.^[4] This is achievable from roughly 1.5 cups of cooked barley, or two to three servings of barley-enriched bread or crackers. Spent Goods products are made with spent grain flour that retains the fibre and protein of the original barley, making it easier to reach this target without eating a bowl of grain at every meal.

Blood Sugar and Glycaemic Response

Barley has one of the lowest glycaemic indices (GI) of any grain — approximately 25–30 for whole grain barley, compared to 70+ for white bread and 64 for white rice. The beta-glucan gel slows gastric emptying, meaning glucose enters the bloodstream more gradually and peak insulin demand is reduced. This makes barley particularly relevant for people managing type 2 diabetes or insulin resistance, as well as anyone seeking to avoid the energy crashes associated with high-GI carbohydrates.^[5]

Research from Lund University showed that barley kernel bread consumed at breakfast and lunch reduced appetite and improved glucose tolerance with effects measurable the following day — attributed to short-chain fatty acids produced when gut bacteria ferment barley fibre overnight.^[6] The same study found that the metabolic response was linked to the gut microbiome composition of participants, reinforcing the interconnection between barley’s prebiotic properties and its blood sugar benefits.

Gut Health and the Microbiome

Barley’s insoluble fibre acts as a prebiotic — feeding beneficial bacteria already present in the gut rather than introducing new ones. Regular barley consumption supports the growth of Bifidobacterium, Lactobacillus, and Prevotella species associated with reduced inflammation, better immune function, and a lower risk of colorectal cancer.^[6]

This prebiotic effect is amplified in fermented barley products. The long fermentation process used to make our sourdough — combined with spent grain flour — creates a product that delivers both the prebiotic fibre of barley and the benefits of real sourdough fermentation. Learn how to store sourdough properly to preserve these benefits →

Satiety and Weight Management

The combination of high soluble fibre, moderate protein, and low GI makes barley one of the most satiating grains available. A Lund University randomised crossover study found that participants who ate barley-based bread at two consecutive meals showed significantly reduced appetite hormones and improved insulin sensitivity for up to 13–14 hours afterwards — a substantially longer satiety window than participants experienced with white wheat bread.^[6] The researchers attributed this primarily to the production of gut-derived short-chain fatty acids, particularly propionate, which signals fullness to the brain via the gut-brain axis.

Barley vs. Other Common Grains

On the key metrics that matter for metabolic health — fibre, glycaemic index, and beta-glucan — barley leads the grains most people eat daily:

Grain (100g cooked)	Dietary Fibre	Protein	GI	Beta-glucan
Barley	3.8g	2.3g	25–30	~2–3g
Oats (rolled, cooked)	1.7g	2.4g	55	~1–2g
Brown rice	1.8g	2.6g	50–55	Trace
Whole wheat	1.9g	3.9g	45–50	Trace
Quinoa	2.8g	4.4g	53	None
White rice	0.4g	2.7g	64–72	None

Why Spent Grain Barley Still Delivers

Spent grain is the barley left over after brewers extract fermentable sugars during the mashing process. The brewing process removes most of the starch — which is converted to alcohol — but leaves the fibre, protein, and mineral content largely intact. The result is a grain that is typically 15–25% protein and 40–50% dietary fibre on a dry weight basis, compared to 8–12% protein and 2–3% fibre in whole wheat flour.^[7]

At Spent Goods, we dry and mill spent brewery barley into flour and incorporate it into our breads, bagels, and crackers. Every product you buy diverts grain from landfill and puts it to higher nutritional use — without sacrificing any of the benefits barley is known for. You can also read more about the nutritional profile of spent grains and how we transform brewery waste into food.

Frequently Asked Questions

Sources & Further Reading

1. Ho HVT et al. (2016). A systematic review and meta-analysis of randomized controlled trials of the effect of barley β-glucan on LDL-C, non-HDL-C and apoB for cardiovascular disease risk reduction. European Journal of Clinical Nutrition, 70, 1340.
2. Talati R et al. (2010). β-glucan from barley and its lipid-lowering capacity: a meta-analysis of randomized, controlled trials. European Journal of Clinical Nutrition, 64(12), 1472–1480.
3. Health Canada (2012). Summary of Health Canada’s Assessment of a Health Claim about Barley Products and Blood Cholesterol Lowering.
4. EFSA Panel on Dietetic Products, Nutrition and Allergies (2011). Scientific Opinion on the substantiation of a health claim related to barley beta-glucans and lowering of blood cholesterol. EFSA Journal, 9(12), 2470.
5. Srivastava AK et al. (1991). Glycaemic response to maize, bajra and barley. Journal of the American College of Nutrition, 35(4), 249–254.
6. Dahl WJ et al. / Lund University group (2019). Abundance of gut Prevotella at baseline and metabolic response to barley prebiotics. European Journal of Nutrition, 58(6), 2365–2376.
7. Spent Goods. Nutritional benefits of spent grains. SpentGoods.ca.