Is Sparkling Water Good for High Blood Pressure?

Plain sparkling water does not appear to raise blood pressure in any lasting or harmful way, but the honest scientific answer is that researchers still aren’t sure whether people with hypertension should treat it differently from still water. A 2024 systematic review concluded that the question “remains unanswered,” largely because most studies have looked only at what happens in the minutes during and after drinking, not over weeks or months.¹ What the research does show is a more interesting and layered picture than a simple yes-or-no, touching on everything from the type of sodium in your water to how cold it is when you drink it.

The Short-Term Blood Pressure Spike

Drinking any water causes a brief rise in blood pressure. Your body detects the volume entering the stomach, the vagus nerve fires, and sympathetic activity nudges your blood pressure upward for a few minutes. Carbonated water amplifies this spike compared to still water. In one study, drinking cold carbonated water raised systolic blood pressure by roughly 33 mmHg in younger adults and about 48 mmHg in older adults, measured during the act of drinking. Cold still water produced smaller but still notable jumps of about 23 and 42 mmHg, respectively. Room-temperature water caused the mildest response, around 15 mmHg in younger people and 22 mmHg in older adults.²

Those numbers sound alarming, but context matters. These are fleeting peaks that happen while you’re actively swallowing, driven partly by the mechanical act of gulping and partly by the CO₂ stimulating nerve endings in the throat and stomach. The spike fades within minutes, though a residual elevation of about 5 to 10 mmHg persisted during the recovery period for cold and cold carbonated water. Older adults consistently showed larger pressor responses than younger adults across all conditions, which suggests this is worth knowing about if you already have poorly controlled hypertension or are prone to blood pressure swings.

A separate study found that carbonated water increased mean arterial pressure more than non-carbonated water, along with an increase in blood flow to the brain, though heart rate and sweat rate stayed the same.³ The nervous system, rather than any chemical property of the carbonation itself, seems to be the main driver of these immediate effects. Whether these brief spikes add up to anything meaningful over months of regular consumption is exactly the gap in the research that the 2024 systematic review highlighted.

Not All Sodium Is Created Equal

If you’ve ever flipped a bottle of sparkling mineral water around and noticed sodium on the label, you probably felt a twinge of concern. Sodium is the nutrient people with high blood pressure are told to limit. But a growing body of evidence suggests that the form sodium comes in matters as much as the amount.

Table salt is sodium chloride. Most sparkling mineral waters that list sodium contain it primarily as sodium bicarbonate, a fundamentally different compound. In a controlled trial, sodium chloride did not change blood pressure, but sodium bicarbonate actually lowered systolic blood pressure by about 5 mmHg in hypertensive subjects. The study also found that sodium chloride increased calcium loss through urine while sodium bicarbonate did not.⁴ That calcium-sparing effect hints at a distinct metabolic pathway.

A 2025 review in a major cardiology journal went further, arguing that chloride, rather than sodium itself, may be the primary culprit behind salt-driven hypertension. Chloride appears to activate the hormonal system that raises blood pressure and retains fluid, while sodium bicarbonate seems to exert minimal effects on blood pressure and blood volume.⁵ If that distinction holds up in larger long-term studies, it means the sodium in naturally carbonated mineral water may be far less problematic than the sodium in processed foods. This does not mean you should ignore sodium content entirely, but it does mean reading “sodium” on a sparkling water label is not the same red flag as reading it on a bag of chips.

What Happens to Aldosterone

Aldosterone is a hormone your adrenal glands produce to regulate sodium and fluid balance. When aldosterone is high, your body retains more sodium and water, which pushes blood pressure up. One randomized controlled trial tested a high-bicarbonate, sodium-rich sparkling water and found that aldosterone levels dropped significantly, while blood pressure remained stable. Urinary calcium excretion also decreased, and the amount of sodium leaving through urine increased, suggesting the body was efficiently clearing the extra sodium without retaining it in a way that would elevate pressure.⁶

The fact that aldosterone fell while blood pressure stayed steady is telling. It suggests the bicarbonate may be working through hormonal pathways that actually ease the body’s tendency to hold onto fluid, the opposite of what you’d expect from just adding sodium. Researchers still need to confirm this in larger and longer trials, but it aligns with the sodium chloride versus sodium bicarbonate distinction discussed above.

Minerals in the Water and Their Effect on Blood Pressure

Not all sparkling waters are just water plus CO₂. Naturally carbonated mineral waters can carry meaningful amounts of calcium and magnesium, and both of those minerals have established links to blood pressure regulation. A study that tracked people with low urinary levels of magnesium and calcium, indicating low body stores of these minerals, found that drinking mineral water for four weeks produced significant decreases in both systolic and diastolic blood pressure.⁷

A large population study in Bangladesh reinforced this, finding that people drinking naturally mineral-rich water had higher urinary calcium and magnesium and lower blood pressure.⁸ The practical takeaway is that if your sparkling water of choice is a mineral-rich variety listing calcium and magnesium on the label, it could offer a modest blood pressure benefit, particularly if your diet is already low in those minerals. Plain seltzer or club soda, which are just filtered water with added CO₂ (and sometimes sodium), won’t carry these same minerals unless they’ve been added.

Cardiovascular Risk Markers Beyond Blood Pressure

Blood pressure is only one piece of cardiovascular health. Cholesterol, blood sugar, and markers of inflammation all contribute to long-term risk, and some of the more striking sparkling water research involves these broader markers rather than blood pressure directly.

In a study of postmenopausal women, drinking a sodium-rich carbonated mineral water for two months lowered total cholesterol by about 7% and LDL (“bad”) cholesterol by about 15%, while raising HDL (“good”) cholesterol by roughly 9%. Fasting blood sugar also dropped by about 7%, and two markers of vascular inflammation fell significantly.⁹ Those are large effect sizes for a dietary change as simple as switching water. The likely mechanism involves the bicarbonate altering conditions in the gut in ways that increase bile acid excretion, which pulls cholesterol out of circulation.¹⁰

A separate crossover trial in adults with moderately high cholesterol tested two different mineral waters and found that total cholesterol, LDL cholesterol, glucose, and several cardiovascular risk ratios all improved over the course of the study. Interestingly, blood pressure itself did not change during the trial, which again supports the pattern that sparkling mineral water can improve cardiovascular risk without raising blood pressure.¹¹

CO₂ in Water and Blood Vessel Function

Some of the most intriguing research on carbonation and the cardiovascular system comes not from drinking studies but from bathing studies. In parts of Europe and Japan, soaking in CO₂-rich mineral springs has been used therapeutically for centuries, and modern research has started to measure what actually happens to blood vessels during these soaks.

When healthy young adults immersed their lower legs in warm carbonated water, their blood vessels dilated more effectively afterward, as measured by a standard test of endothelial function. Arterial stiffness also decreased.¹² A follow-up study confirmed that carbonated water immersion boosted skin blood flow and the blood supply to the immersed limb far more than plain warm water, with the increase in arterial blood flow roughly three times greater in the carbonated condition.¹³ This historical use in European spa medicine has been documented across multiple cardiovascular rehabilitation settings.¹⁴

CO₂ absorbed through the skin acts as a local vasodilator, relaxing smooth muscle in blood vessel walls. This is a fundamentally different pathway from what happens when you drink carbonated water, so you can’t directly extrapolate from soaking studies to drinking studies. But it does show that dissolved CO₂ interacts with the cardiovascular system in ways that go beyond mere bubbles, and it suggests that CO₂ in water is not inherently vessel-damaging. If anything, the topical evidence points in the opposite direction.

Why Temperature Matters More Than You’d Think

The pressor response data mentioned earlier carries a practical implication that often gets overlooked. Cold carbonated water produced the largest blood pressure spike of any condition tested, especially in older adults, where systolic pressure jumped by an average of about 48 mmHg during drinking.² Room-temperature sparkling water produced a substantially smaller response. If you’re concerned about blood pressure and enjoy sparkling water, letting it come up toward room temperature before drinking may meaningfully reduce the acute spike. Most people prefer their sparkling water chilled, so this is genuinely useful to know.

The cold stimulus and the carbonation stimulus appear to be additive. Cold activates thermoreceptors and triggers a sympathetic reflex; carbonation stimulates chemoreceptors and stretch receptors in the esophagus and stomach. When both hit at once, the nervous system response is amplified. For a healthy 30-year-old, a brief spike that resolves in minutes is unlikely to matter. For someone who is 70, on blood pressure medication, and already running systolic readings in the 150s, a sudden 48-point jump, even if transient, is worth discussing with a doctor.

Sparkling Water Is Not a Soft Drink

One of the biggest sources of confusion in this area is the lumping together of plain sparkling water with carbonated soft drinks. They share bubbles and almost nothing else. A comprehensive review of carbonated soft drink consumption found that daily intake of sugar-sweetened beverages was linked to a 27% higher risk of type 2 diabetes and a 9% increased risk of cardiovascular disease.¹⁵ Those risks come from the sugar, the phosphoric acid, and the other additives, not from the carbonation.

When studies report that “carbonated beverages” raise cardiovascular risk, the vast majority are studying sodas. Plain sparkling water, whether it is seltzer, club soda, or naturally carbonated mineral water, has no sugar, no phosphoric acid, and negligible calories. Treating it as equivalent to cola because both have bubbles is a category error that leads people to avoid a perfectly fine beverage. The flavored sparkling waters that have become popular in recent years sit somewhere in between: they generally contain no sugar or calories, but some include citric acid, artificial sweeteners, or sodium citrate. None of these additives have been linked to blood pressure increases in the amounts typically found in flavored sparkling water, but they are worth noting if you are tracking total sodium or acid intake.

The Satiety and Weight Connection

High blood pressure and excess weight are tightly linked. Anything that helps with appetite control could have an indirect benefit for blood pressure. Carbonated water has a modest satiating effect: the CO₂ distends the stomach, triggering stretch receptors and a brief uptick in heart rate and sympathetic tone that signals fullness. One study in young women found that the feeling of fullness after drinking carbonated water was significant, though short-lived, and was driven by increased gastric and cardiac activity after consumption.¹⁶

Whether this translates into meaningful calorie reduction or weight loss over time hasn’t been rigorously tested. But if reaching for a glass of sparkling water before a meal helps you eat slightly less, and if that helps you maintain a healthier weight, the downstream effects on blood pressure could easily outweigh any concerns about the brief post-swallow spike.

What the Packaging Adds

A less obvious consideration is what leaches into sparkling water from its container. A study screening beverages for endocrine-disrupting chemicals found that 144 out of 162 products contained detectable levels of compounds like bisphenols, PFAS, and parabens. The concentrations were highest in beverages packaged in metal cans, while glass and carton packaging showed lower or undetectable levels. For some compounds, the estimated daily intake from typical beverage consumption exceeded safety guidelines by a wide margin.¹⁷ Endocrine disruptors have been linked in other research to metabolic dysfunction and cardiovascular risk, though the evidence connecting canned beverage consumption specifically to blood pressure changes is still emerging. If you drink sparkling water regularly and want to minimize chemical exposure, glass bottles are the cleanest option.

How to Choose a Sparkling Water if Blood Pressure Is a Concern

Putting the evidence together, a few practical guidelines emerge for people watching their blood pressure:

Read the label for mineral content: A sparkling mineral water listing calcium, magnesium, and bicarbonate may offer modest blood pressure and cholesterol benefits. Plain seltzer, which is just carbonated tap water, won’t carry those minerals unless they’ve been added.
Check the sodium source: Sodium bicarbonate in mineral water behaves differently from sodium chloride in processed food. A moderate amount of sodium from a bicarbonate-rich water is not the same threat as the same milligrams from table salt.
Drink it closer to room temperature: Cold carbonated water produces the sharpest transient blood pressure spike, especially in older adults. Letting it warm slightly before drinking reduces this effect.
Choose glass over cans when possible: Metal cans leach more endocrine-disrupting chemicals into the beverage than glass packaging.
Don’t confuse it with soda: The cardiovascular risks attributed to “carbonated beverages” in the literature are overwhelmingly about sugar-sweetened soft drinks, not plain sparkling water.

None of these steps require giving up sparkling water. The overall evidence, while incomplete, leans toward sparkling water being a neutral-to-mildly-beneficial choice for most people managing blood pressure, with the main caveat that very cold servings can cause short-lived pressure spikes that warrant caution in older adults or those with poorly controlled hypertension.