Beet

Beets are unusually rich in inorganic nitrate. The body converts dietary nitrate to nitrite and then nitric oxide — a signaling molecule that relaxes blood vessels. Multiple trials show beet juice (about 500ml) drops systolic blood pressure by 4-8 mmHg within hours, with smaller sustained effects when consumed regularly. Endurance athletes also use beet juice for its modest effect on exercise economy.

Oxalates and kidney stones

Beets are among the highest-oxalate foods commonly eaten — comparable to spinach and Swiss chard. For people with a history of calcium-oxalate kidney stones, that's a meaningful reason to limit intake. Pairing beets with a calcium source (yogurt, dairy) at the same meal binds some oxalate in the gut and reduces absorption. For everyone else, oxalate is not a practical concern at normal dietary doses.

Practical notes

Beeturia — pink or red urine after eating beets — is harmless and happens in about 10-14% of people, depending on iron status and gut absorption. The pigment (betalain) is also a natural food coloring and is the reason canned beets can stain everything they touch. Roasting concentrates the sweetness; the greens (beet tops) are even higher in oxalate than the root.