Brussels Sprouts: Nutrition Facts, Health Benefits, and Why They Deserve a Place on Your Plate

Brussels sprouts are perhaps the most unfairly maligned vegetable in existence. For generations they’ve been the butt of dinner table jokes — grey, soggy, sulphurous monstrosities forced upon unwilling children at Christmas dinners. That reputation is almost entirely a cooking method problem rather than a flavor problem. Properly prepared Brussels sprouts — roasted until caramelized, pan-fried until crispy, or lightly steamed rather than boiled to mush — are genuinely delicious.

More importantly for this page: they are nutritionally extraordinary. Brussels sprouts provide 117% of the daily Vitamin K requirement, 69% of Vitamin C, 25% of Vitamin A, meaningful folate, and a comprehensive glucosinolate profile that rivals broccoli for cancer-preventive potential — all at just 36 calories per 100g. They are one of the most nutritionally dense vegetables available and one of the most underserved in terms of genuinely useful nutritional information online.

This page sets that record straight.

Brussels Sprouts Nutrition Facts (per 100g, cooked)

Brussels Sprouts Nutrition Facts (per 100g raw vs. cooked)

Raw Brussels sprouts retain more Vitamin C, fiber, and glucosinolates than cooked — but are more difficult to digest and cause more gas for many people. Light steaming or roasting strikes the best balance between nutrient retention, glucosinolate preservation, digestibility, and most importantly — palatability.

Vitamins in Brussels Sprouts (per 100g, cooked)

Standout: Brussels sprouts deliver a remarkable dual vitamin achievement at just 36 calories — 117% of the daily Vitamin K requirement and 69% of daily Vitamin C in the same 100g serving. This combination is particularly powerful because the two vitamins work synergistically — Vitamin C supports collagen synthesis for connective tissue while Vitamin K activates the proteins that direct calcium into bones and prevent arterial calcification. Getting both at high levels from a single 36-calorie food is genuinely extraordinary. Brussels sprouts also provide 25% of daily Vitamin A from beta-carotene and 15% of folate — completing one of the most comprehensive vitamin profiles of any common vegetable.

Minerals in Brussels Sprouts (per 100g, cooked)

Standout: Brussels sprouts’ mineral profile is modest in individual percentages but comprehensive in breadth — covering potassium (317mg per 100g) for heart and muscle function, iron (7% DV) in a form where the accompanying Vitamin C dramatically enhances its absorption, and manganese (13% DV) for bone formation and antioxidant defense — all at negligible caloric cost. The iron-Vitamin C pairing within the same food is particularly valuable for plant-based eaters.

Brussels Sprouts as a Cruciferous Vegetable: The Glucosinolate Story

Like broccoli, Brussels sprouts belong to the Brassica family of cruciferous vegetables — and they share the same fundamental biochemistry that makes this family nutritionally exceptional.

Brussels sprouts contain high concentrations of glucosinolates — sulphur-containing compounds that, when the vegetable is chopped, chewed, or damaged, are converted by the enzyme myrosinase into biologically active compounds including sulforaphane, indole-3-carbinol (I3C), and other isothiocyanates.

Of all common cruciferous vegetables, Brussels sprouts have particularly high concentrations of sinigrin — a glucosinolate that converts to allyl isothiocyanate — and glucoraphanin — the precursor to sulforaphane (the same powerful compound found in broccoli). This makes Brussels sprouts, alongside broccoli and broccoli sprouts, among the most glucosinolate-rich foods available.

Maximising Glucosinolates from Brussels Sprouts

The same principles that apply to broccoli’s sulforaphane apply here:

Chop or halve before cooking — cutting Brussels sprouts allows myrosinase activity before heat deactivates it. Halving them 30–40 minutes before cooking maximizes glucosinolate conversion to active compounds.

Avoid boiling — boiling is the worst preparation method for glucosinolate retention. Studies have found that boiling Brussels sprouts for 9–15 minutes destroys up to 58% of glucosinolates. Boiling also produces the sulphurous smell — from volatile glucosinolate breakdown products released into steam — that is responsible for Brussels sprouts’ infamous reputation.

Roast, steam lightly, or stir-fry — roasting produces the best flavor while retaining meaningful glucosinolates. Light steaming (5–7 minutes) preserves more glucosinolates than boiling. Microwaving surprisingly retains glucosinolates well due to short cooking time.

Add mustard seed — as with broccoli, adding mustard seed powder to cooked Brussels sprouts provides exogenous myrosinase to convert surviving glucoraphanin to sulforaphane in the digestive system — partially compensating for cooking-related myrosinase deactivation.

The Cooking Method Revolution: Why Roasted Brussels Sprouts Are a Different Food

This deserves special attention because it explains why so many people who hate Brussels sprouts have simply never had them cooked properly.

Why Boiled Brussels Sprouts Taste Bad

When Brussels sprouts are boiled for extended periods (the traditional method), several things happen simultaneously that create the notorious bitter, sulphurous taste:

Glucosinolates break down to produce volatile sulphur compounds — sinigrin degrades to allyl isothiocyanate (the compound responsible for the sharp taste of mustard and horseradish). This releases into steam and permeates the kitchen, and the cooked sprout carries a concentrated bitter, pungent flavor.

Cell walls break down completely — creating the mushy, soft texture that many people find unpleasant.

Natural sugars are lost into the cooking water rather than caramelizing.

Chlorophyll breaks down — producing the grey-green color that visually signals “overcooked vegetable.”

Why Roasted Brussels Sprouts Taste Completely Different

Roasting at high heat (200–220°C) produces opposite effects:

Maillard reaction — the same browning reaction that makes seared steak and toasted bread delicious happens on the cut surfaces of Brussels sprouts. Amino acids and sugars react at high temperatures to create hundreds of new flavor compounds — producing rich, nutty, savory flavors that bear no relationship to boiled sprouts.

Caramelization — the natural sugars (1.9g per 100g) caramelize on the cut surfaces, adding sweetness that offsets any residual bitterness.

Crispy outer leaves — the outermost leaves become crispy and almost chip-like when roasted — a textural element that is genuinely enjoyable rather than unpleasant.

Concentrated flavor — water evaporates during roasting rather than diluting into boiling water, concentrating the natural flavors of the sprout.

Reduced volatile sulphur compounds — the sulphurous compounds escape into oven ventilation rather than absorbing back into the sprout as they do in boiling water.

Simple roasting method: Halve Brussels sprouts, toss in olive oil, salt, and pepper, spread cut side down on a baking tray, roast at 200°C for 20–25 minutes until deeply golden on the cut surface with crispy outer leaves. Add balsamic vinegar or lemon juice after roasting if desired.

Health Benefits of Brussels Sprouts

Exceptional Vitamin K for Bone and Arterial Health

At 117% of daily Vitamin K per 100g cooked, Brussels sprouts are one of the most concentrated Vitamin K sources available from any vegetable — rivaling broccoli and approaching the levels found in leafy greens like kale and spinach.

The practical significance of this extraordinary Vitamin K content:

Bone mineralisation — Vitamin K activates osteocalcin, the protein that binds calcium into bone tissue. Without adequate Vitamin K, dietary and supplemental calcium cannot be efficiently incorporated into bone matrix — making Vitamin K as important as calcium itself for bone density. Research has found that people with higher Vitamin K intake have significantly better bone mineral density and lower fracture risk.

Arterial calcification prevention — Vitamin K activates matrix Gla protein (MGP), which prevents calcium from depositing in arterial walls. This is one of the most important mechanisms for preventing arterial stiffness and cardiovascular disease. Populations with consistently higher Vitamin K intake — including those eating diets rich in Brussels sprouts, broccoli, and leafy greens — show lower rates of coronary artery calcification.

Blood clotting — Vitamin K is essential for the synthesis of clotting factors II, VII, IX, and X in the liver. Without adequate Vitamin K, the blood’s coagulation cascade cannot function properly.

Important warfarin note: The very high Vitamin K content of Brussels sprouts significantly affects warfarin (a Vitamin K antagonist blood thinner) dosing. People taking warfarin must not suddenly increase or decrease their Brussels sprouts or other leafy green intake — consistency of Vitamin K intake is critical for stable anticoagulation. Always discuss dietary changes with your doctor if you take warfarin.

Outstanding Vitamin C Content

At 69% of daily Vitamin C per 100g cooked — and 94% raw — Brussels sprouts are one of the richest Vitamin C sources available, far exceeding the concentration in most citrus fruits by weight.

Vitamin C in Brussels sprouts serves multiple critical functions:

Collagen synthesis — Vitamin C is the essential cofactor for prolyl hydroxylase and lysyl hydroxylase — the enzymes that crosslink collagen fibers into their characteristic triple helix structure. Without adequate Vitamin C, collagen is structurally weak — affecting skin elasticity, tendon and ligament strength, cartilage integrity, and wound healing. This is directly relevant to athletes whose connective tissue is under constant training stress.

Immune function — Vitamin C supports neutrophil chemotaxis, natural killer cell activity, and lymphocyte proliferation — multiple aspects of both innate and adaptive immune defense. Adequate Vitamin C from whole food sources like Brussels sprouts maintains immune function more effectively than equivalent doses from supplements in some research.

Iron absorption enhancement — consuming Brussels sprouts alongside iron-containing plant foods (lentils, spinach, fortified grains) dramatically improves non-haem iron absorption — up to 3-fold with adequate Vitamin C co-consumption. This is particularly valuable for plant-based eaters where iron absorption from plant sources is otherwise limited.

Antioxidant protection — as the primary water-soluble antioxidant, Vitamin C neutralizes free radicals throughout the body’s aqueous environments, regenerates Vitamin E from its oxidized form, and protects DNA and proteins from oxidative damage.

Cancer Prevention — Glucosinolate Power

Brussels sprouts’ cancer-preventive credentials are among the strongest of any vegetable. The evidence operates at multiple levels:

Epidemiological evidence — multiple large cohort studies have found inverse associations between cruciferous vegetable consumption and cancer risk — particularly for colorectal, lung, breast, bladder, and prostate cancers. A 2017 meta-analysis found each additional 100g serving of cruciferous vegetables per week associated with a 3.2% reduction in overall cancer risk.

Glucosinolate mechanisms — sulforaphane (from glucoraphanin), allyl isothiocyanate (from sinigrin), and indole-3-carbinol (I3C) all contribute to cancer prevention through:

• Nrf2 activation — the master regulator of antioxidant and detoxification gene expression
• Phase 2 enzyme induction in the liver — enhancing neutralization and excretion of carcinogens
• HDAC inhibition — reactivating silenced tumor suppressor genes
• Apoptosis induction in cancer cells — promoting programmed death of abnormal cells
• Cell cycle arrest — preventing cancer cells from dividing

Indole-3-carbinol specifically — I3C, found in high concentrations in Brussels sprouts, has been particularly studied for its effects on oestrogen metabolism. I3C promotes conversion of oestrogen to a less potent form — 2-hydroxyestrone — rather than the more potent 16-alpha-hydroxyestrone. This shift in oestrogen metabolism may reduce oestrogen-sensitive cancer risk, particularly breast and cervical cancers. Clinical trials of I3C have shown promising results for prevention of oestrogen-sensitive cancers.

Heart Health

Brussels sprouts support cardiovascular health through a remarkable combination of mechanisms:

Vitamin K — prevents arterial calcification through MGP activation as discussed above.

Sulforaphane and glucosinolates — reduce arterial inflammation through NF-κB inhibition and improve endothelial function — the health of blood vessel inner lining cells that regulate vascular tone.

Vitamin C — prevents LDL cholesterol oxidation — a critical step in atherosclerotic plaque formation. Oxidised LDL is far more damaging to arterial walls than unoxidised LDL — Vitamin C’s antioxidant protection at this step is directly cardiovascular-protective.

Potassium — 317mg per 100g counteracts sodium’s blood pressure-raising effects and supports healthy cardiac rhythm.

Fiber — 2.6g per 100g contributes to soluble fiber intake that reduces LDL cholesterol through bile acid binding.

Alpha-linolenic acid (ALA) — Brussels sprouts contain small but meaningful amounts of ALA omega-3 fatty acid — one of the few vegetables to provide this heart-healthy fat. While ALA converts inefficiently to EPA and DHA, it contributes to the overall omega-6 to omega-3 balance that influences inflammatory status.

Gut Health and Digestive Support

Brussels sprouts support gut health through several complementary mechanisms:

Fiber — 2.6g per 100g cooked contributes to the prebiotic fiber intake that feeds beneficial gut bacteria and supports bowel regularity. Raw Brussels sprouts provide even more fiber (3.8g per 100g).

Glucosinolate fermentation — glucosinolates that escape absorption in the small intestine are fermented by gut bacteria in the colon, producing compounds with anti-inflammatory effects on the colonic environment.

Sulforaphane and gut health — sulforaphane has documented antimicrobial properties against H. pylori (the bacterium responsible for most stomach ulcers) and protective effects on gut barrier integrity — reducing intestinal permeability and supporting the gut lining.

Gas and bloating — the honest truth: Brussels sprouts cause gas in many people — probably more than most vegetables. The combination of fiber, glucosinolates, and raffinose (an indigestible oligosaccharide) creates significant fermentation in the colon. This is a sign of prebiotic activity rather than a negative health effect — but practically speaking it’s worth knowing.

Strategies for reducing gas:

• Choose roasting over boiling — roasting reduces glucosinolate and raffinose content more than boiling
• Start with smaller portions and increase gradually — gut microbiome adaptation reduces gas over 2–4 weeks of regular consumption
• Consume earlier in the day rather than at dinner — less overnight fermentation discomfort

Blood Sugar Management

With a glycaemic index of approximately 15 — one of the lowest of any food — Brussels sprouts produce virtually no blood sugar response. Their combination of fiber, protein, and very low sugar content makes them one of the most blood-sugar-friendly vegetables available.

The fiber in Brussels sprouts also has clinically meaningful effects on post-meal blood sugar when eaten alongside higher-GI foods — the combination of fiber slowing gastric emptying and forming a protective gel in the small intestine reduces the glycaemic response of the overall meal. Including Brussels sprouts regularly in meals with starchy carbohydrates moderates the blood sugar impact of those meals.

Eye Health

Brussels sprouts contain meaningful concentrations of lutein and zeaxanthin — the carotenoids that concentrate in the macular region of the retina where they filter harmful blue light and protect against age-related macular degeneration. Combined with their beta-carotene content (contributing to the 25% Vitamin A DV), Brussels sprouts are one of the more eye-health-supportive non-orange vegetables available.

Detoxification Support

Like broccoli, Brussels sprouts activate phase 2 detoxification enzymes in the liver through their glucosinolate content — particularly sulforaphane’s activation of Nrf2 and the subsequent upregulation of glutathione S-transferases, UDP-glucuronosyltransferases, and other enzymes that neutralize and prepare environmental toxins and carcinogens for safe excretion. This is a specific, mechanistically understood biochemical process that represents genuine detoxification support — not the pseudoscientific “cleansing” of wellness marketing.

Brussels Sprouts for Athletes and Active People

Vitamin C for Connective Tissue Integrity

Athletes place enormous repetitive stress on tendons, ligaments, and cartilage — collagen-dependent structures that require consistent Vitamin C availability for maintenance and repair. Brussels sprouts’ 69% DV of Vitamin C per 100g cooked directly supports the collagen synthesis that keeps these structures resilient under training load.

Vitamin K for Bone Density

Weight-bearing exercise and resistance training stimulate bone formation — but only when the nutritional building blocks are present. Adequate Vitamin K from Brussels sprouts supports the osteocalcin activation needed to efficiently incorporate calcium into bone matrix during the bone remodelling that training stimulates.

Iron with Built-In Absorption Enhancement

Brussels sprouts provide 7% DV of non-haem iron per 100g — and their 69% DV of Vitamin C significantly enhances that iron’s absorption. The iron-Vitamin C pairing within the same food is a particular advantage for plant-based athletes and premenopausal women who need to maintain iron status for optimal oxygen transport and aerobic performance.

Anti-Inflammatory Recovery Support

Brussels sprouts’ sulforaphane, Vitamin C, and Vitamin E work through complementary antioxidant and anti-inflammatory mechanisms to support recovery from exercise-induced muscle damage without suppressing the beneficial inflammatory adaptations that training requires.

Low Calorie, High Volume for Cutting Phases

At 36 calories per 100g, Brussels sprouts allow very large portions with minimal caloric impact — supporting the high-volume eating that satisfies hunger during calorie-restricted cutting phases without compromising the caloric deficit needed for fat loss.

The ALA Omega-3 Content: A Surprising Bonus

Brussels sprouts contain a small but notable amount of alpha-linolenic acid (ALA) — the plant-based omega-3 fatty acid. At approximately 0.1–0.2g per 100g, Brussels sprouts are one of the few non-seed vegetables to provide meaningful ALA.

While ALA converts only inefficiently to EPA and DHA (the long-chain omega-3s with the strongest anti-inflammatory evidence), every contribution to the dietary omega-3 to omega-6 ratio matters — particularly in modern diets dominated by omega-6-rich industrial seed oils. Brussels sprouts’ modest ALA content, combined with their anti-inflammatory glucosinolates and antioxidants, contributes to the overall anti-inflammatory dietary pattern that supports long-term health and performance.

Brussels Sprouts vs. Other Cruciferous Vegetables

Brussels sprouts stand out as the cruciferous vegetable with the highest glucosinolate concentration among commonly available supermarket vegetables — exceeding even broccoli in total glucosinolate content per gram in most analyses. Their combination of very high Vitamin K, Vitamin C, and glucosinolates alongside meaningful fiber and protein at only 36 calories makes them arguably the most nutritionally comprehensive of all cruciferous vegetables per calorie.

How to Select and Store Brussels Sprouts

Selecting: Choose firm, bright green sprouts with tightly packed leaves. Avoid any that are yellowing, have loose or wilting leaves, or feel soft. Smaller sprouts (2–3cm diameter) tend to be more tender and less bitter than very large ones. Sprouts still on the stalk are the freshest option — they can be kept on the stalk for several days after purchase.

Storing: Unwashed, in a sealed bag or container in the refrigerator. Use within 3–5 days for best flavor and maximum vitamin C content (Vitamin C degrades over time after harvest).

Freezing: Blanch in boiling water for 3 minutes, immediately transfer to ice water, drain, and freeze in a single layer before transferring to bags. Frozen Brussels sprouts retain most nutritional value and are excellent for roasting or cooking (slightly less crispy than fresh when roasted but perfectly nutritious).

Practical Ways to Include Brussels Sprouts in Your Diet

Roasted with olive oil — the definitive Brussels sprouts preparation. Halve, toss with olive oil, salt, pepper, and optional garlic. Roast cut-side down at 200°C for 20–25 minutes until deeply caramelized. Optional additions before or after roasting: balsamic vinegar, lemon zest, Parmesan, crispy bacon, toasted almonds, chilli flakes.

Pan-fried — halved sprouts pan-fried cut-side down in olive oil or butter over medium-high heat for 5–7 minutes until deeply golden — then flipped and cooked 3–4 minutes more. The fastest route to caramelized flavor.

Shaved raw in salads — very thinly sliced raw Brussels sprouts make an exceptional salad base — nutty, slightly crunchy, and holding up well to dressings without wilting. Classic combination: shaved Brussels sprouts with lemon-Parmesan dressing, toasted pine nuts, and dried cranberries.

Stir-fried — halved or quartered Brussels sprouts stir-fried with garlic, ginger, soy sauce, and sesame oil — an Asian-inspired approach that produces excellent results with minimal cooking time.

Steamed — 5–7 minutes of steaming preserves the most Vitamin C and glucosinolates of any cooked preparation. Dress immediately with olive oil and lemon juice after steaming to maximize both flavor and fat-soluble vitamin absorption.

In grain bowls — roasted Brussels sprouts with brown rice, a protein source, avocado, and a tahini or miso dressing create a nutritionally complete meal with an outstanding combination of Vitamin K, Vitamin C, complex carbohydrates, and complete protein.

Soup — blended Brussels sprouts soup with onion, garlic, vegetable stock, and a touch of cream is nutritionally excellent and surprisingly sweet and delicate in flavor — very different from the sulphurous reputation.

Why People Hate Brussels Sprouts (and Why They Shouldn’t)

The science behind the Brussels sprouts reputation is actually well-studied — and entirely preparation-dependent.

The supertaster effect: Approximately 25% of the population are “supertasters” — people with a higher density of taste buds who perceive bitter compounds more intensely than others. Glucosinolates and their breakdown products taste more bitter to supertasters, which may explain why some people have a genuine, physiologically based aversion to Brussels sprouts that others don’t share. For supertasters, roasting (which reduces bitter glucosinolate content through caramelization) and adding balancing flavors (sweetness from balsamic, richness from cheese or bacon, acidity from lemon) dramatically improves palatability.

The genetic factor — TAS2R38: There’s a specific taste receptor gene (TAS2R38) that makes some people genetically predisposed to perceive the bitterness of PTC (phenylthiocarbamide) and related compounds in Brussels sprouts. People with two copies of the “bitter” variant of this gene find Brussels sprouts significantly more bitter than those with one or no copies. This is genuinely genetic — not a matter of being a picky eater.

The boiling method: As discussed in detail above — boiling produces the sulphurous smell and mushy texture that has defined most people’s negative Brussels sprouts experiences. Roasting produces a completely different product that most Brussels-sprouts-haters find genuinely enjoyable.

Potential Considerations

Warfarin interaction — as discussed above, consistent Vitamin K intake is critical for people on warfarin. Sudden large increases in Brussels sprouts consumption can affect INR (International Normalised Ratio — the measure of blood clotting time used to monitor warfarin therapy). Maintain consistency rather than dramatically varying intake.

Thyroid and goitrogens — Brussels sprouts contain goitrogens that can interfere with thyroid iodine uptake at very high consumption levels in people with already-low iodine intake or pre-existing hypothyroidism. Cooking significantly reduces goitrogenic activity. For people with normal thyroid function eating reasonable amounts (1–2 servings per day), this is not a meaningful concern.

Gas and bloating — as discussed above. Start with smaller portions, choose roasting over boiling, and allow 2–4 weeks for gut microbiome adaptation.

FODMAPs — Brussels sprouts are moderate to high in FODMAPs (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) that can exacerbate symptoms in people with IBS. Limiting portion size to 2–3 sprouts per serving during a low-FODMAP approach is typically better tolerated than larger servings.