If you eat more foods rich in nitrate—like spinach or beets—your blood pressure might drop a little bit each day, and this effect is even stronger if you already have high blood pressure. It could be a natural way to help manage blood pressure without pills.

A double-blind, placebo-controlled RCT in adults (n≥200) where participants are randomized to receive daily dietary nitrate supplements at 0, 1, 2, and 3 mmol/day for 4 weeks, with acute systolic blood pressure measured via ambulatory monitoring at baseline and each week; hypertensive subgroup analyzed separately.

A prospective cohort study tracking 5,000 adults over 1 year using validated food frequency questionnaires and 24-hour dietary recalls to estimate daily nitrate intake, with repeated ambulatory BP measurements every 3 months; stratified analysis by baseline hypertension status to assess dose-response relationship between nitrate intake and systolic BP change.

A nested case-control study within an existing RCT cohort comparing individuals with the greatest systolic BP reduction (cases) to those with minimal change (controls), matched for age, sex, and baseline BP, to assess whether higher dietary nitrate intake was associated with larger BP reductions, specifically in hypertensives.

A cross-sectional study measuring dietary nitrate intake via food diary and plasma nitrate/nitrite levels in 1,000 adults, with single-point systolic BP measurement, comparing BP levels across quartiles of nitrate intake, stratified by hypertension status.

A meta-analysis pooling individual participant data from all published RCTs of dietary nitrate supplementation (≥1 mmol/day) with acute systolic BP outcomes, stratifying by baseline hypertension status, to estimate pooled mean change in systolic BP per mmol/day increase.