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Evidence-Informed Nutrition Support

Hypertension & Blood Pressure

Nutrition strategies associated with meaningful blood pressure reduction in human RCTs — clearly graded by evidence strength.

Framing: Even modest BP reductions (2–5 mmHg systolic) reduce stroke risk measurably at a population level. These strategies complement, not replace, medication management when BP is ≥130/80.

1 — What the evidence supports

Strong — Multiple RCTs
  • DASH diet reduces systolic BP 8–14 mmHg (Appel 1997, NEJM)
  • Sodium restriction <2.3g/day reduces systolic BP 2–8 mmHg across meta-analyses
  • Potassium 3.5–5g/day from food consistently lowers BP
  • Magnesium 300–400 mg/day: −2 mmHg systolic in 34-RCT meta-analysis (Zhang 2016)
  • Aerobic exercise 30 min/day reduces systolic BP ~5–8 mmHg
  • Alcohol reduction: each standard drink/day raises systolic BP ~1 mmHg
Moderate — Consistent signal
  • Hibiscus tea: ~5 mmHg reduction in small RCTs
  • Beetroot juice (dietary nitrate) reduces BP acutely 3–5 mmHg
  • Dark chocolate flavanols: 3–5 mmHg in meta-analyses
  • Garlic: consistent but modest signal (~3 mmHg)

2 — Weak or overhyped

  • Licorice root: raises blood pressure significantly via aldosterone-like effects — avoid in hypertension
  • High-dose Vitamin D: no BP benefit in VITAL trial
  • Celery seed extract: limited human evidence; do not substitute for proven approaches
  • Salt substitutes without medical supervision: KCl substitutes raise potassium dangerously in kidney disease

3 — Foods to emphasize

  • Fruits and vegetables — 8–10 servings/day (DASH)
  • Low-fat dairy 2–3 servings/day
  • Leafy greens — high dietary nitrate
  • Beets and beet juice
  • Oily fish 2–3×/week
  • Unsalted nuts
  • Olive oil
  • Hibiscus tea daily

4 — Foods to reduce

  • High-sodium processed foods
  • Cured and deli meats
  • Pickled and canned foods
  • Restaurant food (often 3,000mg Na per meal)
  • Alcohol >1 drink/day (women), >2 (men)
  • Energy drinks

5 — Key labs to track

Primary
  • Systolic/diastolic BP (home monitor)
  • Morning resting BP trend
  • Serum potassium (if on diuretics)
  • 24-hour ambulatory BP
Secondary
  • Sodium intake (food diary)
  • eGFR and creatinine
  • RBC Magnesium
  • Uric acid
Tracking
  • Home BP cuff — twice daily morning
  • Sleep quality (sleep apnea raises BP)
  • HRV (autonomic function)
  • Weight trend

6 — Supplement considerations

Evidence-graded. Click any to see the full EBL evidence card.
Magnesium Glycinate
−2 mmHg systolic in 34-RCT meta-analysis; depleted by diuretics
Tier 1 · Grade A
EPA/DHA Omega-3
Modest BP reduction at ≥3g/day; primary benefit is cardiovascular
Tier 1 · Grade A
CoQ10
Modest BP reduction in meta-analysis — more relevant in cardiac patients
Tier 2 · Grade B

⚠ Medication & Nutrient Cautions

  • Potassium supplements + ACE inhibitors/ARBs: hyperkalemia risk — food sources are safer
  • Magnesium + diuretics: diuretics deplete magnesium; supplementation may help but coordinate
  • Licorice root: raises BP — avoid entirely
  • NSAIDs (ibuprofen): raise blood pressure and blunt antihypertensive medication effect
  • Decongestants (pseudoephedrine): raise BP acutely

Full contraindications tool → · Drug-nutrient depletion checker →

8 — When to consult your physician

  • Systolic BP ≥130 mmHg on two measurements
  • Any BP ≥160/100 mmHg — medication typically indicated
  • Before starting potassium supplements (kidney disease risk)
  • If home readings are consistently inconsistent with clinic readings
  • Suspected secondary hypertension (young patient, sudden onset, resistant to treatment)
  • Headache, visual changes, or chest pain with elevated BP — urgent evaluation
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