Beets pack a surprisingly dense mix of vitamins, minerals, and plant compounds into a low-calorie package. A single medium beet (about 82 grams) has just 35 calories but delivers folate, potassium, fiber, and a class of pigment-based antioxidants you won’t find in most other vegetables.
Calories, Carbs, and Fiber
One medium beet contains roughly 8 grams of carbohydrates, 2 grams of fiber, 1 gram of protein, and 6 grams of natural sugar. That sugar content is higher than many vegetables, which is why beets taste noticeably sweet when roasted. But it’s less concerning than the number alone suggests: boiled beets have a glycemic index of 64 (medium range), while their glycemic load is only 5, which is very low. Glycemic load accounts for portion size, and because beets are mostly water by weight, the actual blood sugar impact of eating them is modest.
The fiber in beets is a mix of soluble and insoluble types. Two grams per beet isn’t extraordinary on its own, but beets are easy to eat in quantity, whether roasted as a side dish, blended into smoothies, or shredded raw into salads, so the fiber adds up quickly.
Key Vitamins and Minerals
Folate is the standout. A single serving of beets provides about 19% of the Daily Value for folate (vitamin B9), which plays a central role in DNA synthesis and red blood cell formation. That makes beets one of the better whole-food sources of this nutrient, particularly relevant for women who are pregnant or planning to become pregnant.
Beets also supply about 221 milligrams of potassium per serving, contributing to the mineral that helps regulate fluid balance and blood pressure. You’ll get around 4% of your Daily Value for iron, along with meaningful amounts of magnesium and several other B vitamins. There’s a small amount of vitamin C as well, roughly 6 milligrams per cup of beet juice, which isn’t a major source but does help your body absorb the non-heme (plant-based) iron that beets contain.
Manganese, though harder to find precise beet-specific percentages for, is present in notable amounts. WebMD lists beets as an excellent source of both folate and manganese, a trace mineral involved in bone formation and metabolism.
Betalains: The Pigments That Double as Antioxidants
The deep red-purple color of beets comes from betalains, a family of pigments found in very few foods. Maroon beets contain an average of about 142 milligrams of betalains per 100 grams, with the dominant compound being betanin, which accounts for roughly 59% of the pigment content. Yellow and golden beet varieties contain betalains too, though at about 24% of the concentration found in red beets, with a different pigment profile dominated by vulgaxanthin compounds.
What makes betalains interesting beyond their color is their antioxidant strength. Betanin, the primary pigment in red beets, has a free radical scavenging activity 3 to 7.5 times higher than vitamin C. This potency comes from its molecular structure, which readily donates electrons to neutralize unstable molecules that can damage cells. Research has confirmed anti-inflammatory and anticarcinogenic properties in betalains as well, though most of those findings come from lab and animal studies rather than large human trials.
Because betalains are water-soluble and somewhat heat-sensitive, raw or lightly cooked beets retain more of these compounds than heavily boiled ones. If you’ve ever noticed your cooking water turning bright pink, that’s betalains leaching out. Roasting or steaming preserves more of them than boiling in large amounts of water.
Dietary Nitrates and Blood Pressure
Beets are one of the richest food sources of inorganic nitrates, and this is where much of the recent health interest comes from. When you eat beets, the nitrates are absorbed in your upper intestine, then extracted from your blood by your salivary glands and secreted back into your mouth. Bacteria on your tongue convert the nitrate into nitrite. When you swallow that saliva, the nitrite enters your bloodstream and gets converted into nitric oxide, a molecule that relaxes and widens blood vessels.
This process leads to measurable drops in blood pressure. A study published in the American Heart Association’s journal Hypertension found that a daily 250-milliliter dose of beetroot juice (containing about 6.4 millimoles of nitrate) produced sustained blood pressure lowering in people with hypertension. The effect isn’t limited to juice. Whole beets, both raw and cooked, contain these same nitrates, though juice concentrates them into a more easily measured dose.
Don’t Forget the Greens
If you’re buying whole beets with the tops still attached, the leafy greens are worth keeping. Beet greens are edible and nutritionally distinct from the root. They’re a source of vitamins A and K, calcium, and potassium. Vitamin K in particular is abundant in dark leafy greens, and beet tops are no exception. You can sauté them like spinach, add them to soups, or mix them into grain bowls.
Cooked beet root and beet greens complement each other well nutritionally. One cup of diced, cooked beetroot provides about 70 calories, 15 grams of carbohydrates, 3 grams of fiber, and 2 grams of protein, along with the B vitamins, potassium, and magnesium concentrated in the root. The greens add fat-soluble vitamins the root lacks.
Oxalates: One Thing to Know
Beets contain 152 milligrams of oxalates per cup, placing them among the higher-oxalate vegetables. Oxalates are natural compounds that can bind to calcium in your body and, in susceptible people, contribute to the formation of calcium oxalate kidney stones. If you’ve had kidney stones before or have been told you’re at risk, this is worth factoring into how often and how much you eat beets. For everyone else, the oxalate content is not a practical concern at normal dietary amounts. Pairing beets with calcium-rich foods (like cheese or yogurt) can actually reduce oxalate absorption, since the binding happens in your gut rather than your kidneys.