How to Lower Diastolic Blood Pressure (the Bottom Number)

Quick answer: The bottom number is your diastolic pressure — the force in your arteries between heartbeats. It runs high when your small arteries stay stiff and tense around the clock. The levers that move it most: weight loss (each kg down ≈ 1 mmHg), sodium under 1,500 mg/day, less alcohol, treating sleep apnea, and regular aerobic exercise. A diastolic consistently over 90 needs a doctor’s eyes; over 100 is where treatment usually starts.

Isolated diastolic hypertension — good top number, stubborn bottom one — shows up constantly in people under 50. The catch: there’s less research on it than on systolic, and most “lower your blood pressure” advice quietly assumes you mean the top number. Here’s the bottom-number version.

The Snack Checker does that comparison for you: one barcode, and sodium, sugar and salt come back per 100 g.

What makes the diastolic number climb

Your heart relaxes between beats. During that rest window, your arteries should recoil and pressure should fall. When arteries are stiff — or the sympathetic nervous system (your “tense” wiring) stays switched on — the pressure between beats stays elevated. The usual drivers:

• Extra body weight — visceral fat raises resting vascular tone. This is the single strongest diastolic driver in younger adults.
• Alcohol — even 2 drinks/day nudges diastolic up; heavy drinking raises it clearly.
• Sleep apnea — overnight oxygen dips crank up the stress hormones, and the effect carries into daytime diastolic readings. If your partner says you snore like a chainsaw and your morning BP is the high one, get screened.
• Chronic stress and poor sleep — keep the sympathetic system half-lit 24/7.
• Sodium — hits both numbers, but in salt-sensitive people the diastolic moves too.
• Early kidney involvement — the kidneys and blood pressure regulate each other; a stubbornly high diastolic is one reason a basic kidney panel (creatinine + eGFR) belongs in the workup. If yours has never been checked, our GFR levels chart explains the numbers.

How to lower it — ranked by evidence

1. Lose the visceral weight. Roughly 1 mmHg per kg lost; in young adults with isolated diastolic hypertension, this alone normalizes readings for many.
2. Cut sodium to under 1,500 mg/day for a few weeks and see how your numbers respond — some people are far more salt-sensitive than others.
3. Rethink alcohol. Two weeks off and most people see the diastolic drop. It’s the fastest single experiment on this list.
4. 30 minutes of aerobic work, 5 days a week — brisk walking counts. Aerobic exercise directly improves artery elasticity, which is the mechanical problem behind a high bottom number.
5. Fix the sleep. Screen for apnea if you snore or wake unrefreshed; keep a consistent sleep window. Nighttime BP that fails to dip is its own risk signal.
6. Stress wiring down — slow breathing (about 6 breaths a minute, 5 minutes twice daily) has real trial support for both numbers.
7. Potassium-rich foods (if your kidneys are healthy) — bananas, potatoes, beans. Potassium balances sodium’s effect. Note the if: with reduced kidney function, potassium is a lab-managed number, not a free upgrade — see low potassium foods guidance if CKD applies to you.

When the bottom number is an emergency

Diastolic 120+ with chest pain, severe headache, vision changes, weakness, or shortness of breath is a hypertensive emergency — ER, not home remedies. Diastolic 100–119 without symptoms needs a same-week appointment, not an ambulance, but it isn’t a “watch it” number either.

The lifestyle-habits question people actually ask

“I changed everything and my BP still won’t go down — why?” Three usual suspects: hidden sodium (restaurant and packaged food, not the salt shaker), sleep apnea, and measurement error (cuff too small, back unsupported, talking during the reading). Fourth suspect: white-coat elevation, which home readings settle.

“Can it go down on its own?” Sometimes — readings do drift down after stress resolves or alcohol stops. But if it’s above 90 for weeks, treat it as data to act on, not weather.

“Does the bottom number matter as much as the top?” After 50, systolic generally drives risk more. Under 50, an isolated high diastolic is the classic early-warning sign — catching it now is the cheap win.

This is education, not a diagnosis. Bring your home readings — a week of morning and evening numbers — to any prescriber conversation. More plain-language numbers: blood pressure range explained and systolic vs diastolic.

This guide is also available in Spanish: Cómo bajar la presión arterial diastólica (la de abajo).

Full Guide

Educational content only — not a substitute for advice from your doctor or pharmacist. Always work with your care team.