Lowering your diastolic blood pressure, the bottom number in a reading, comes down to a combination of regular exercise, dietary changes, weight management, and attention to sleep quality. A diastolic reading below 80 mm Hg is considered normal, while 80 to 89 falls into stage 1 hypertension and 90 or higher is stage 2. The good news: measurable improvements can begin within weeks of making changes.
Why the Diastolic Number Rises
Diastolic pressure measures the force on your artery walls between heartbeats, when your heart is resting. A high diastolic number typically means your smaller blood vessels are offering too much resistance to blood flow. In adults under 50, this increased resistance in the blood vessel walls is the primary driver of a rising diastolic reading. After 50, the picture gets more complicated because arterial stiffness starts playing a larger role alongside that resistance.
This distinction matters because it tells you something practical: for most people with an elevated diastolic number, the strategies that improve blood vessel flexibility and reduce constriction are the ones that work best.
Exercise Is the Most Effective Single Change
A large meta-analysis published in the British Journal of Sports Medicine compared every major type of exercise for blood pressure reduction. The results were striking. Isometric exercises, where you hold a position under tension without moving (like wall sits or plank holds), ranked first for lowering both systolic and diastolic pressure. They reduced diastolic pressure by an average of 4.0 mm Hg. Traditional aerobic exercise like walking, cycling, or swimming lowered diastolic pressure by about 2.5 mm Hg.
That doesn’t mean you should skip cardio in favor of wall sits. Aerobic exercise carries enormous benefits for heart health, metabolic function, and weight management. But adding two to three sessions per week of isometric holds, even just a few minutes each session, can give your diastolic number an extra push downward. Resistance training with weights also performed well, ranking second behind isometric exercise for diastolic reduction.
Lose Weight, Even a Little
If you’re carrying extra weight, losing even a modest amount makes a real difference. A meta-analysis of randomized controlled trials found that for every kilogram lost (about 2.2 pounds), diastolic pressure drops by roughly 0.9 mm Hg. That means losing 10 pounds could lower your diastolic reading by about 4 points. The effect is consistent and well-documented across studies, and it stacks with the benefits of exercise and dietary changes.
Cut Back on Sodium and Alcohol
Reducing sodium intake lowers blood pressure gradually over about four weeks. The current general recommendation is to stay under 2,300 mg of sodium per day, with greater benefits seen at lower intakes. Most of the sodium in a typical diet comes from processed and restaurant foods rather than the salt shaker, so reading labels and cooking more meals at home tend to be the most practical starting points. Following the DASH diet, which emphasizes fruits, vegetables, whole grains, and lean protein while limiting sodium, has been shown to lower blood pressure by 1 to 4 mm Hg within the first week.
Alcohol is another lever worth pulling. Heavy drinkers (more than three drinks a day for women or four for men) who cut back to moderate levels can expect their diastolic pressure to drop by about 4 mm Hg. Even if you don’t drink heavily, keeping intake to one drink per day or less reduces the ongoing stress alcohol places on your cardiovascular system. Binge drinking, defined as four or more drinks in two hours for women and five or more for men, causes short-term blood pressure spikes that can be significant.
Sleep Problems Can Quietly Raise Diastolic Pressure
This is one of the most overlooked contributors to a high diastolic number. Obstructive sleep apnea, where breathing repeatedly stops and restarts during sleep, has a particularly strong link to isolated diastolic hypertension. In fact, diastolic pressure is often the first number to rise in early, undiagnosed sleep apnea. The mechanism involves repeated drops in oxygen levels overnight that trigger your nervous system to constrict blood vessels, an effect that carries over into daytime readings.
Even without apnea, sleep duration matters. Sleeping fewer than five hours per night significantly increases hypertension risk in people under 60, and the sweet spot for blood pressure appears to be seven to eight hours. If you snore loudly, wake up feeling unrefreshed, or have a partner who has noticed you gasping during sleep, getting evaluated for sleep apnea could be one of the most impactful things you do for your diastolic number. Many people with treated sleep apnea see meaningful blood pressure improvements.
How Quickly You Can Expect Results
Blood pressure responds to lifestyle changes faster than most people expect. Dietary shifts like following the DASH eating pattern can produce measurable drops within the first week. Sodium reduction works more gradually, with steady improvement over about four weeks. Exercise benefits accumulate over weeks to months of consistent activity. When you combine several strategies at once, the effects are additive, meaning a person who starts exercising, loses some weight, and cuts sodium could realistically see their diastolic pressure drop by 5 to 10 points or more over one to three months.
When Medication Becomes Part of the Plan
The 2025 guidelines from the American Heart Association and American College of Cardiology recommend starting with lifestyle changes when diastolic pressure is between 80 and 89, particularly for people without existing heart disease and at lower cardiovascular risk. If your diastolic number stays at 80 or above after three to six months of consistent lifestyle effort, medication is typically recommended as an addition to those changes, not a replacement for them.
For diastolic readings of 90 or higher, or for anyone who already has heart disease, stroke history, or heart failure, medication is generally recommended alongside lifestyle changes from the start. The most commonly prescribed first-line options fall into four categories: a type of water pill that helps your body shed excess fluid, calcium channel blockers that relax blood vessel walls, and two classes of drugs that block a hormone system involved in blood vessel constriction. Your doctor will choose based on your other health conditions and how you respond. For stage 2 hypertension, combining two medications in a single pill from the beginning is now the preferred approach because it controls pressure faster and is easier to stick with than taking two separate pills.
The most important thing to understand about the diastolic number is that it responds to the same core strategies as overall blood pressure, but certain approaches like isometric exercise, weight loss, alcohol reduction, and treating sleep apnea appear to have an outsized effect on it. Stacking several modest changes together is what produces the most significant and lasting results.