Diastolic blood pressure, the bottom number in your reading, reflects how much pressure your arteries maintain between heartbeats. A normal diastolic reading is below 80 mm Hg, while 80 to 89 is stage 1 hypertension and 90 or higher is stage 2. Lowering it comes down to reducing the resistance in your smaller blood vessels and improving their elasticity, which you can influence through several lifestyle changes and, when needed, medication.
Why Diastolic Pressure Rises
While systolic pressure (the top number) depends heavily on the stiffness of your large arteries, diastolic pressure is driven by the resistance in your smaller blood vessels, called arterioles. When these vessels tighten or lose flexibility, blood pushes against more resistance even during the resting phase of each heartbeat. Excess sodium, chronic stress, poor sleep, excess weight, and regular alcohol use all contribute to this increased resistance. That’s why the strategies below work: each one targets a different piece of that puzzle.
Cut Sodium Intake
Reducing salt is one of the most reliable ways to bring diastolic pressure down, and the effects start quickly. Research from the American Heart Association shows that cutting salt intake by about 3 grams per day (roughly half a teaspoon) lowers diastolic pressure by about 1.9 mm Hg in people with hypertension. A larger reduction of 6 grams per day nearly doubles that effect, dropping diastolic pressure by around 3.9 mm Hg. Even people with normal blood pressure see some benefit, though the effect is smaller.
What’s particularly encouraging is the timeline. Switching to a lower-sodium diet continues to lower blood pressure progressively over at least four weeks, meaning you haven’t seen the full benefit after just a few days. 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 makes the biggest difference.
Increase Potassium-Rich Foods
Potassium works as a natural counterbalance to sodium. A large meta-analysis published in The BMJ found that increasing potassium intake lowered diastolic pressure by about 3.1 mm Hg in people with hypertension. The World Health Organization recommends adults consume at least 3,500 mg of potassium per day for cardiovascular benefit. Most people fall well short of that.
Good sources include bananas, potatoes, beans, spinach, avocados, and yogurt. The key is consistency. A single high-potassium meal won’t move the needle, but building these foods into your regular diet will. If you have kidney disease, potassium intake needs to be managed more carefully, since the kidneys regulate how much stays in your blood.
Adopt the DASH Diet
The Dietary Approaches to Stop Hypertension (DASH) diet combines higher potassium, lower sodium, and an overall eating pattern rich in fruits, vegetables, whole grains, and lean protein. It lowers blood pressure within one week of starting, and that effect holds steady over time. Pairing DASH with additional sodium restriction provides even greater benefit, since sodium reduction continues lowering pressure for at least four weeks beyond the initial dietary shift.
Lose Weight if You Carry Extra
Weight loss has a direct, measurable effect on diastolic pressure. A meta-analysis of 25 studies found that every kilogram of weight lost (about 2.2 pounds) corresponds to roughly a 1 mm Hg drop in blood pressure. In the Trial of Hypertension Prevention, one of the largest studies on this topic, participants who lost just 2 kilograms (about 4.4 pounds) over six months saw their diastolic pressure fall by 2.7 mm Hg. You don’t need to reach an ideal weight to benefit. Even modest, sustained weight loss makes a meaningful difference.
Exercise, Including Isometric Training
Aerobic exercise like brisk walking, cycling, or swimming is well-established for lowering blood pressure. But a less obvious option, isometric exercise, also shows real promise for diastolic pressure specifically. In a randomized trial published in the Journal of the American Heart Association, participants who squeezed a handgrip device three times per week for eight weeks lowered their diastolic pressure by about 3 mm Hg. The protocol was simple: four rounds of two-minute squeezes at moderate effort, with four-minute rest periods between rounds.
This type of training works by improving blood vessel function over time, and it’s easy to fit into a daily routine. Combining it with regular aerobic activity gives you the broadest benefit.
Reduce Alcohol Consumption
Alcohol raises diastolic pressure in a dose-dependent way, meaning the more you drink, the higher it climbs. A large study from Boston University found that people averaging just one standard drink per day (about 12 grams of alcohol) had a diastolic increase of 1.14 mm Hg over time. At four drinks per day, the increase reached 3.1 mm Hg. There was no safe threshold below which alcohol had no effect on pressure. If your diastolic reading is already elevated, cutting back or eliminating alcohol is one of the faster ways to see improvement.
Address Sleep Quality and Sleep Apnea
Poor sleep has a uniquely strong connection to diastolic pressure. Obstructive sleep apnea, a condition where breathing repeatedly stops during sleep, is a common and underdiagnosed driver of isolated diastolic hypertension, where the bottom number is high even when the top number looks relatively normal. This happens because each breathing interruption triggers a surge of stress hormones that tighten blood vessels, preventing the normal overnight dip in blood pressure.
Sleeping fewer than five hours per night also significantly increases hypertension risk in adults under 60, even after accounting for weight and diabetes. If you snore loudly, wake up feeling unrested, or your partner has noticed pauses in your breathing, a sleep study can determine whether apnea is contributing to your blood pressure. Treating sleep apnea with a continuous positive airway pressure device often brings diastolic readings down noticeably.
When Lifestyle Changes Aren’t Enough
For many people, combining several of these strategies produces enough of a drop to bring diastolic pressure into a healthy range. But when readings remain at 90 mm Hg or above despite consistent effort, medication becomes an important tool. The three most commonly prescribed classes for hypertension are ACE inhibitors (or a related class called ARBs), calcium channel blockers, and thiazide diuretics. These work by relaxing blood vessels, reducing fluid volume, or blocking hormones that constrict arteries. Your doctor will choose based on your overall health profile, and many people start with a single low-dose medication.
How Quickly to Expect Results
The timeline depends on which changes you make. Dietary shifts through the DASH pattern can lower pressure within a single week. Sodium reduction builds progressively, with benefits still accumulating at the four-week mark. Weight loss and exercise typically take a few weeks to a couple of months to show measurable results, though the cardiovascular benefits begin before the numbers on a blood pressure cuff change. Isometric handgrip training showed results after eight weeks in clinical trials. Stacking multiple interventions accelerates the overall effect, which is why guidelines emphasize a combined approach rather than relying on any single change.