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A glass of beet juice a day could keep the heart doctor away. A 2013 study showed that drinking eight ounces of beet juice could lower a person's systolic blood pressure by an average of 10.5 points within 24 hours—only a few points lower than the reduction found with some blood pressure meds. Beets contain high levels of nitrate, which the body converts to nitric oxide. In turn, nitric oxide helps improve blood flow.