Hypertension, defined as a blood pressure reading of 140/90 mm Hg or above, is a primary risk factor for stroke and heart attack. But the perils of hypertension do not suddenly appear as blood pressure readings cross that threshold. Many people fall into the murky zone of borderline hypertension, in which blood pressure is higher than ideal but not yet at a point where medications are recommended. Making diet and lifestyle changes proven to lower blood pressure can prevent or delay the need to take high blood pressure medicines in the future.
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