A type of nutrient found in vegetables like spinach and lettuce may be Mother Nature’s way of keeping blood pressure in check.
A small new study published at New England Journal of Medicine suggests the nitrates in many vegetables, such as spinach, lettuce, or beetroot, may keep blood vessels healthy and lower blood pressure.
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Biosingularity 
Hypertension, most commonly referred to as “high blood pressure”,HTN or HPN, is a medical condition in which the blood pressure is chronically elevated. Hypertension can be classified as either essential (primary) or secondary. Hypertension is considered to be present when a person’s systolic blood pressure is consistently 140 mmHg or greater, and/or their diastolic blood pressure is consistently 90 mmHg or greater. Hypertension is one of the most common complex disorders, with genetic heritability averaging 30%. Hypertension can also be produced by diseases of the renal arteries supplying the kidney.