You probably know the usual advice for lowering blood pressure. Eat more fruits and vegetables, cut back on salt, move a little more each day. For millions of people on blood pressure drugs, that advice has come with a quiet warning.
The reason was potassium. Common blood pressure drugs can raise potassium levels, and very high potassium can strain the heart. So patients have long been told to go easy on potassium-rich foods.
A new trial presented at the American Heart Association's Hypertension Scientific Sessions on October 8, 2026 says that caution has gone too far for most people on these medications.
The DASH diet, built around fruits, vegetables, beans and whole grains, did not raise blood potassium to dangerous levels in participants taking the usual blood pressure medications.
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What the Boston trial measured
Researchers at Beth Israel Deaconess Medical Center followed 356 adults with high blood pressure for 12 weeks.
Half received weekly groceries built around the DASH pattern, aiming for about 4,700 mg of potassium a day, along with nutrition counseling. The other half got a cash stipend to buy their own groceries, with no counseling.
Blood potassium was measured at the start and at the 12-week mark. The DASH group began at 4.16 mmol/L. The control group began at 4.18 mmol/L. Neither number rose meaningfully, and both sat squarely in the normal range.
The participants were taking the medications doctors usually prescribe for high blood pressure. ACE inhibitors, angiotensin receptor blockers (ARBs), potassium-sparing diuretics, beta-blockers and non-steroidal anti-inflammatory drugs (NSAIDs) were all represented.
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Lead researcher Marian Budu of Beth Israel Deaconess called the DASH diet "a well-known, proven nutrition pattern that is known to improve blood pressure."
The one group that should still be careful
There is a real exception. The trial did not include people with stage 4 or 5 kidney disease, or people whose baseline potassium was already elevated. In those patients, potassium can build up to dangerous levels, and the usual caution still applies.
If you have advanced kidney disease or chronically high potassium, your doctor's rules about potassium-rich foods remain in place. For almost everyone else managing high blood pressure, the DASH pattern is back on the plate.
The Boston trial was limited to Black adults with an average age of 53, and the researchers note that broader confirmation in other groups is still needed.
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What the DASH diet actually asks for
The National Heart, Lung, and Blood Institute describes DASH as an eating pattern built around fruits, vegetables, whole grains, lean protein, nuts and low-fat dairy.
The target is about 4,700 mg of potassium a day, with sodium held under 2,300 mg. That means more vegetables and fruit than most Americans eat on a typical day. Bananas, potatoes, spinach, beans, oranges, tomatoes and yogurt all show up on the list.
Nearly half of American adults have high blood pressure, about 119.9 million people, according to the Centers for Disease Control and Prevention. For patients outside the kidney exception, that puts the DASH diet back on the daily menu.
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This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.