Researchers at King’s College London found that chewing sugary bubble gum after drinking a beetroot shot dropped blood pressure by nearly 3 points — and the sugar itself is what made it work.
Quick Take
- Chewing sugary gum after beetroot lowered systolic blood pressure by almost 3 mmHg and diastolic by almost 2 mmHg compared to sugar-free gum.
- The sugar creates a more acidic mouth, which helps bacteria on the tongue convert beetroot’s nitrates into nitrites that relax blood vessels.
- Salivary nitrite levels rose 45% and blood nitrite levels rose 25%, peaking about 2.5 hours after the combination.
- The study is the first to track pH changes across the whole body over several hours, not just in the mouth.
Why Beetroot and Bacteria Are the Real Story
Beetroot is loaded with nitrates. Your body needs to turn those nitrates into nitrites before they can relax blood vessels and lower pressure. That conversion happens in your mouth, done by bacteria that live on your tongue. The problem is that most people’s mouths are not acidic enough to let those bacteria work at full speed. That is the gap this King’s College London study set out to close.
The researchers gave participants a beetroot shot, then had them chew either sugary or sugar-free gum. The sugary gum dropped the mouth’s pH by about 1.4 points, creating a noticeably more acidic environment. That acidity turbo-charged the tongue bacteria. Nitrite in saliva jumped 45% and nitrite in the blood rose 25%, with the peak effect arriving around two and a half hours later. Blood pressure followed. Systolic pressure fell by nearly 3 mmHg and diastolic by nearly 2 mmHg compared to the sugar-free group.
It Is the Acid, Not the Sugar Calories
The lead researcher was clear on this point: the calories and sweetness in the gum are not doing the work. The acid is. Sugar produces acid as it breaks down in saliva, and that acid is what flips the switch for the bacteria. This matters because it explains why sugar-free gum, which uses artificial sweeteners that do not produce the same acid, failed to deliver the same effect. The mechanism is specific and measurable, not a vague nutritional hunch.
Dietary nitrate research has a strong track record here. Multiple large reviews show that nitrate from plant foods consistently lowers blood pressure, especially systolic pressure, across dozens of studies. A four-week daily nitrate trial in hypertensive patients produced sustained drops in blood pressure by boosting the same nitrate-to-nitrite pathway. The King’s College finding fits cleanly into that body of evidence. It does not overturn anything. It adds a practical trick for getting more out of a food that already works.
What the Study Does Not Yet Tell Us
The effect peaks at 2.5 hours and the study does not follow participants beyond that window. There is no data yet on whether doing this daily for weeks or months keeps pressure lower over time. The study also does not break down results by whether participants had high blood pressure to begin with, which makes it hard to know how useful this would be for someone already managing hypertension. Those are real gaps, and they matter before anyone calls this a treatment.
There is also the sugar question. Dentists and nutrition professionals will reasonably push back on any advice to chew sugary gum regularly. That concern is fair, but it does not touch the mechanism the researchers identified. The acidity is the active ingredient, not the sugar itself as a nutrient. Whether a lower-sugar or differently acidic alternative could produce the same result is a logical next step that no one has tested yet. Until then, the finding stands on its own terms, with the limits clearly visible.
A Small Number That Carries Real Weight
Three mmHg sounds tiny. But population-level research shows that a sustained 2 to 3 mmHg drop in systolic blood pressure across a large group meaningfully cuts the rate of stroke and heart attack. The question is whether this acute spike in nitrite production can be made to last. The existing evidence on daily dietary nitrate suggests it can, at least with consistent intake. Combining a proven food source with a simple, cheap oral chemistry trick is the kind of low-cost, low-risk idea that deserves a proper long-term trial. The King’s College team has opened a door. Someone now needs to walk through it.
Sources:
sciencedaily.com, kcl.ac.uk, kclpure.kcl.ac.uk, pubmed.ncbi.nlm.nih.gov
