Arugula

What It Is

Arugula (Eruca sativa) is a fast-growing leafy green in the mustard family (Brassicaceae), native to the Mediterranean basin and western Asia. It goes by many names — rocket in Britain and Australia, rucola or rughetta in Italian, roquette in French. Unlike most salad greens, arugula has a distinctly peppery, slightly bitter bite that comes from its glucosinolate content, the same class of compounds that give mustard and horseradish their heat.

Culinary use of arugula stretches back to ancient Rome, where it was valued as both a food and an aphrodisiac. Today it is most strongly associated with Italian cuisine — tossed raw with shaved Parmesan and olive oil in the classic insalata di rucola, piled onto thin-crust pizza fresh out of the oven, or scattered over bruschetta. It is a cool-season annual that peaks in spring and autumn; summer heat causes it to bolt, which intensifies the bitterness.

Why It Matters for Longevity

Arugula punches above its weight in longevity-relevant bioactives. It is among the richest leafy-green sources of dietary nitrate, and it carries a meaningful glucosinolate load that activates cellular stress-defence pathways.

Nitric oxide and cardiovascular protection. Arugula contains roughly 250 mg of dietary nitrate per 100 g fresh weight — among the highest of any leafy green. After ingestion, salivary bacteria reduce nitrate to nitrite, which is then converted to nitric oxide (NO) in stomach acid and blood. NO causes smooth muscle in blood vessel walls to relax (vasodilation), which lowers blood pressure, improves endothelial function, and enhances mitochondrial efficiency in muscle tissue. These are all mechanisms that slow cardiovascular aging. (PubMed 29660828)

Glucosinolate-driven Nrf2 activation. Arugula's primary glucosinolate, glucoerucin, is hydrolysed by the enzyme myrosinase — released when cells are disrupted by chewing or chopping — to form erucin, an isothiocyanate. Erucin (and related isothiocyanates from arugula's gluconapin) activates the Nrf2/ARE pathway, a master regulator of the cell's antioxidant and phase-2 detoxification response. This induces enzymes that neutralise carcinogens and reactive oxygen species before they can damage DNA or proteins. Epidemiological cohort data links higher cruciferous vegetable intake to reduced risk of colorectal, lung, and prostate cancers. (PubMed PMC8575925)

Erucin and cancer cell growth inhibition. In cell-culture studies, erucin inhibited proliferation of MCF7 breast cancer cells with an IC50 of 28 µM by arresting the cell cycle at the G2/M checkpoint, disrupting microtubule dynamics, and inducing a 5–9-fold increase in apoptosis at 25 µM. While human dietary concentrations are lower, the mechanistic pathway is plausible and consistent with population-level data on cruciferous vegetable consumption. (PubMed 24950293)

Vitamin K1 for bone and vascular health. At ~109 µg per 100 g (109% of the daily value), arugula is a solid source of vitamin K1, which is required for the carboxylation of osteocalcin (bone mineralisation) and matrix Gla protein (prevention of arterial calcification). Absorption is fat-dependent.

Folate for DNA fidelity. Arugula provides ~97 µg of folate per 100 g (24% DV), supporting one-carbon metabolism — the biochemical cycle that supplies methyl groups for DNA methylation. Adequate folate intake reduces the risk of epigenetic errors that accumulate with age and has been associated with lower homocysteine levels, a cardiovascular risk factor. Folate is heat-sensitive; the raw form in salad preserves it best.

How to Use It

Arugula is most commonly eaten raw, where its myrosinase enzyme remains intact and can fully convert glucosinolates to erucin and other isothiocyanates. Dress it immediately before serving — acid from lemon or vinegar brightens the flavour, and oil ensures fat-soluble vitamins K and carotenoids are absorbed.

If you lightly wilt arugula (e.g., toss it on warm pasta or pizza), the myrosinase is partially inactivated by heat. You can rescue glucosinolate bioactivity by adding raw broccoli sprouts alongside — their active myrosinase can hydrolyse arugula's glucosinolates even when arugula's own enzyme is denatured.

A practical note on nitrate: avoid using antibacterial mouthwash just before eating nitrate-rich foods, as it kills the oral bacteria responsible for the first reduction step (nitrate to nitrite) in the nitric oxide pathway.

Peak season is spring and autumn. Summer-grown arugula tends to be more intensely bitter due to higher glucosinolate concentrations from heat stress.

What to Pair It With

Synergies

• Olive oil (synergy): Oleic acid in EVOO dramatically increases absorption of arugula's fat-soluble vitamins K and carotenoids (lutein, beta-carotene). Dietary fat may also enhance bioavailability of glucosinolate breakdown products by facilitating intestinal absorption.
• Broccoli / broccoli sprouts (synergy): Broccoli contains active myrosinase enzyme. When paired with lightly cooked arugula (where arugula's own myrosinase is heat-denatured), broccoli's enzyme can hydrolyse arugula's glucosinolates and rescue erucin and sulforaphane formation. Combining raw broccoli sprouts with arugula maximises isothiocyanate yield.
• Beets (synergy): Beetroot is also high in dietary nitrate (~250 mg NO3⁻/100 g). Combining arugula with beets provides an additive nitric oxide substrate load, potentially amplifying blood-pressure-lowering and endothelial benefits beyond what either achieves alone.

Flavor Profile

Taste: peppery, bitter, slightly nutty, mildly spicy. Aroma: fresh, green, herbaceous, with a faint sulfurous note from glucosinolates that dissipates quickly. Texture: tender and delicate with a slight crispness when fresh; wilts quickly with heat or acid. Culinary category: leafy green.

The Science

• Erucin and cancer cell proliferation — Erucin (IC50 28 µM) inhibited MCF7 breast cancer cells via G2/M arrest and microtubule disruption; 25 µM caused a 5–9-fold increase in apoptosis. Authors suggest dietary arugula may help retard growth of pre-malignant cells. PubMed 24950293
• Glucosinolates and Nrf2/ARE pathway — Arugula's glucoerucin and gluconapin are hydrolysed to isothiocyanates that activate Nrf2/ARE, inducing phase-2 detoxification enzymes. Epidemiological cohorts link higher cruciferous intake to reduced risk of colorectal, lung, and prostate cancers. PubMed PMC8575925
• Dietary nitrate and nitric oxide — Arugula juice contains ~250 mg NO3⁻/100 g fresh weight, among the highest of any leafy green. Dietary nitrate reduces to nitric oxide in vivo via the entero-salivary cycle, improving endothelial function, lowering blood pressure, and enhancing mitochondrial efficiency. PubMed 29660828

Key Nutrients