Most adults benefit from eating one to two cups of arugula per day, which aligns with the USDA’s broader recommendation of two to three cups of leafy greens daily. A single cup of raw arugula weighs only about 20 grams, so even two cups is a small volume that wilts down to almost nothing when cooked. There’s no established upper limit specific to arugula, but practical concerns like digestive comfort and medication interactions are worth knowing about.
What One Cup of Arugula Gives You
A cup of raw arugula contains roughly 5 calories, making it one of the lowest-calorie foods you can eat. Despite that, it packs a surprisingly dense nutritional profile: about 27% of your daily vitamin K, 3% of your calcium, a meaningful dose of folate, and small amounts of vitamins A and C. On the Aggregate Nutrient Density Index, which scores foods by nutrients per calorie, arugula ranks at 604. That places it below spinach (707) but well above most other salad greens.
Where arugula really stands out is in two categories: dietary nitrates and glucosinolates. These are the compounds that give arugula its peppery bite, and they’re also responsible for most of its health benefits.
Blood Pressure and Nitrate Content
Arugula is one of the richest dietary sources of nitrates, compounds your body converts into nitric oxide. Nitric oxide relaxes blood vessel walls, which lowers blood pressure. In a study on people with high blood pressure, arugula extract produced a peak reduction in systolic blood pressure of nearly 13 mmHg at three hours, with a sustained drop of about 9.5 mmHg still measurable at 24 hours. Nitric oxide levels in the blood roughly doubled over the same period.
That’s a clinically meaningful reduction, comparable to what some blood pressure medications achieve. Eating one to two cups of arugula daily provides a steady supply of dietary nitrates to support this effect, though the concentrated extract used in research delivers more than you’d get from a typical salad. Still, regular consumption adds up. Combining arugula with other nitrate-rich vegetables like beets and spinach amplifies the benefit.
Protective Plant Compounds
Arugula belongs to the cruciferous family alongside broccoli, kale, and cabbage. Its signature compound is erucin, a breakdown product of glucosinolates that forms when you chew or chop the leaves. Erucin has shown strong effects in laboratory studies on cancer cells, particularly melanoma. It slows cell division, triggers programmed cell death, and reduces the ability of cancer cells to migrate and invade surrounding tissue. It also suppresses the production of damaging free radicals and activates the body’s own antioxidant defenses.
These are lab findings, not clinical trials in humans, so they don’t translate directly into “arugula prevents cancer.” But the consistency of results across cruciferous vegetables is one reason dietary guidelines emphasize eating them regularly. One to two cups of arugula daily contributes meaningfully to your total cruciferous vegetable intake.
When More Isn’t Better
Arugula is low in fiber per cup (less than a gram), so it’s unlikely to cause digestive issues even in larger amounts. But eating very large quantities, say four or more cups daily, can concentrate your intake of certain compounds worth watching.
Vitamin K is the main concern for people taking warfarin or similar blood thinners. Arugula is moderately high in vitamin K, and fluctuating your intake from day to day can interfere with how well the medication works. The solution isn’t to avoid arugula. It’s to eat a consistent amount each day so your doctor can calibrate your dosage accordingly. If you eat a cup of arugula on Monday, eat roughly a cup on Tuesday too.
Arugula also contains small amounts of oxalates, which can contribute to kidney stones in people who are prone to them. The levels are much lower than in spinach, so arugula is generally a better choice if oxalates are a concern for you, but it’s still worth noting if you’re eating several cups daily.
Getting the Most From Your Arugula
How you store arugula affects what you get from it. Vitamin C content stays higher when arugula is refrigerated at around 4°C (standard fridge temperature) compared to being left at room temperature. Glucosinolate levels actually increase during the first three days of cold storage before declining, so arugula bought a day or two ago may contain more protective compounds than leaves straight from the field. After about six days in the fridge, both vitamin C and glucosinolates start dropping more noticeably. Aim to use arugula within a week of purchase for the best nutritional value.
Eating arugula raw preserves its glucosinolates and the enzyme (myrosinase) that converts them into active compounds like erucin. Cooking deactivates this enzyme, so if you’re adding arugula to pasta or pizza, toss it on at the very end rather than cooking it down. Chewing raw arugula thoroughly also helps maximize glucosinolate conversion.
A Practical Daily Target
For most people, two cups of raw arugula per day is a reasonable and beneficial target. That’s roughly the size of a generous side salad or a large handful tossed into a smoothie, sandwich, or grain bowl. It provides a solid dose of vitamin K, dietary nitrates, and glucosinolates without any realistic risk of overconsumption. If you’re on blood thinners, keep your daily amount steady rather than varying it. If you find two cups too peppery on its own, mixing arugula with milder greens like romaine or spinach makes it easier to eat consistently.