Sparkling water serves a surprisingly wide range of purposes beyond simple refreshment. It hydrates just as effectively as still water, aids certain digestive issues, plays a role in medical rehabilitation, and even has household applications like stain removal. Here’s a closer look at each use.
Hydration
The most basic use of sparkling water is staying hydrated, and it does this exactly as well as flat water. When researchers used the Beverage Hydration Index, which measures how much fluid your body retains after drinking, sparkling water scored identically to regular water. If you find plain water boring and carbonation helps you drink more throughout the day, switching to sparkling water gives you the same hydration without any trade-off.
Digestive Relief
Many people reach for sparkling water specifically to ease indigestion or constipation. The carbonation appears to stimulate nerves involved in digestion, which can make the process more efficient. Some people find that a glass of sparkling water after a heavy meal reduces bloating and discomfort, though individual responses vary. For constipation in particular, the stimulating effect of carbonation on the gut may help get things moving.
Swallowing Therapy
One of the more specialized uses of sparkling water is in treating people who have difficulty swallowing, a condition called dysphagia. This is common after strokes, in neurological conditions, and in older adults. The carbon dioxide bubbles create a combination of mechanical stimulation and mild acidity in the mouth and throat that activates sensory nerves, essentially “waking up” the swallowing reflex.
Multiple clinical studies have tested this approach. Across the research, carbonated liquids consistently reduced the amount of food or liquid that accidentally entered the airway compared to flat liquids. In several studies, carbonated water also sped up the swallowing process and reduced the amount of residue left in the throat after a swallow. Some patients subjectively reported that swallowing felt easier with carbonated liquids. Speech and language therapists now use carbonated water as one tool in swallowing rehabilitation programs.
A Sugar-Free Swap for Soft Drinks
For people trying to cut back on soda, sparkling water fills the same sensory role: the fizz, the cold bite, the satisfying carbonation. Plain sparkling water contains zero sugar and zero calories, making it a straightforward replacement. This is probably the most common everyday use beyond basic hydration. Flavored varieties exist too, though they come with a caveat covered below.
Cooking and Cocktails
Sparkling water is a staple behind the bar and in the kitchen. Club soda, which is sparkling water infused with minerals like potassium sulfate, sodium chloride, and sodium bicarbonate, is the classic mixer in drinks like gin and tonics (that’s tonic water, actually, which contains quinine) or vodka sodas. In cooking, sparkling water creates lighter batters for frying because the dissolved gas produces extra air pockets as the batter heats. Some bakers use it in pancakes and waffles for the same reason.
It’s worth knowing the differences between varieties. Seltzer is simply carbonated water with no added minerals. Club soda has added mineral salts, which give it a slightly different flavor. Sparkling mineral water comes from natural springs and contains naturally occurring calcium, magnesium, and sodium. Tonic water is the outlier: it contains quinine and usually sugar, so it’s closer to a soft drink than to water.
Stain Removal and Cleaning
Club soda has a long reputation as a stain remover, especially for red wine spills. The science behind this is modest. There’s no strong chemical reason why carbonated water should outperform plain water on stains. The bubbles may provide some gentle mechanical action that helps lift pigment from fabric fibers, and the weak acidity from dissolved carbon dioxide could slightly decolorize certain stains. More likely, the real benefit is that grabbing club soda encourages you to treat the stain immediately, diluting the wine before it sets. Speed matters more than the bubbles themselves, but it doesn’t hurt to have a bottle handy.
What Sparkling Water Does to Your Teeth
Plain sparkling water has a pH of around 5, which puts it in the “minimally erosive” category. For context, anything below a pH of 4 can wear away enamel over time. A study in the Journal of the American Dental Association found that most sparkling waters ranked as minimally erosive, while popular sports drinks were “extremely erosive.” So unflavored sparkling water is not a meaningful threat to your teeth.
Flavored sparkling water is a different story. Lemon-flavored varieties can drop to a pH of around 3, which is acidic enough to erode enamel with regular exposure. If you drink flavored sparkling water frequently, using a straw or rinsing with plain water afterward can reduce contact with your teeth.
The Bone Health Question
A persistent concern is that carbonation leaches calcium from bones. This turns out to be a misunderstanding rooted in research on cola, not sparkling water. A study from the Framingham Osteoporosis Study examined over 2,500 adults and found that non-cola carbonated drinks had no association with low bone mineral density. Cola was linked to lower hip bone density in women, likely because of phosphoric acid, an ingredient found in cola but not in sparkling water.
A separate clinical trial tracked postmenopausal women who drank about a quart of carbonated mineral water daily for eight weeks. Blood and urine tests measuring bone turnover showed no difference compared to women drinking the same amount of still water. Carbonation itself does not harm your bones.
The Appetite and Weight Question
One area where sparkling water may have an unwanted effect is appetite. A study that tracked rats over a year found that those drinking sparkling water (plain or artificially sweetened) gained more weight than those drinking flat water. The mechanism: carbonation triggered a spike in ghrelin, a hormone that signals hunger. Human testing confirmed the hormonal effect. Twenty men who drank carbonated water had triple the blood levels of ghrelin compared to those who drank still water or degassed sparkling water.
This doesn’t mean sparkling water causes weight gain in everyone. The research is limited, and real-world eating behavior is more complex than a single hormone measurement. But if you’re closely managing your appetite, it’s worth being aware that the fizz might make you slightly hungrier than flat water would.