Flavored sparkling water hydrates you about as well as plain water, but it is not identical once you look beyond hydration. The carbonation and the flavor additives, particularly citric acid, change how the drink interacts with your teeth, your stomach, and in some cases your appetite. For most people, swapping plain water for a flavored sparkling water a few times a day is a minor trade, not a harmful one. But the details matter more than the marketing suggests, and the biggest differences have less to do with the bubbles than with what companies add to create the flavor.
Hydration Is Essentially the Same
The core worry people have is whether carbonation somehow makes water less hydrating. It doesn’t. Your body absorbs the water in a carbonated drink the same way it absorbs still water. The carbon dioxide escapes as gas in your stomach and eventually through breathing; it doesn’t block fluid absorption or act as a diuretic. If you drink a glass of flavored sparkling water, you get roughly the same hydration benefit as a glass of tap water. On that front, the two are interchangeable.
Where things start to diverge is in everything besides hydration: what the drink does to your tooth enamel, how the carbonation affects your digestive tract, and what role the added flavoring ingredients play. Those differences range from trivial to worth paying attention to, depending on how much flavored sparkling water you drink and what else is going on in your mouth and gut.
The Real Problem Is Your Teeth, Not the Bubbles
Plain carbonated water is mildly acidic because dissolved carbon dioxide forms carbonic acid, which drops the pH to roughly 3.5 to 4.5. That’s more acidic than tap water but far less acidic than orange juice or cola. On its own, plain sparkling water poses minimal risk to tooth enamel, especially if you’re not sipping it continuously all day.
Flavored sparkling water is a different story. Most brands add citric acid, malic acid, or both to achieve their fruity taste, and those acids push the pH well below what plain carbonation alone would produce. A study testing several commercially available flavored sparkling waters found their pH values ranged from 2.74 to 3.34, with erosive potential similar to or greater than pure orange juice.
That finding is striking because most people think of flavored sparkling water as a healthy, tooth-friendly alternative to juice or soda. In the lab, those flavored waters dissolved hydroxyapatite, the mineral that makes up tooth enamel, at rates comparable to a drink most dentists would tell you to limit.1PubMed. The erosive potential of flavoured sparkling water drinks A separate study confirmed that the erosive effect is cumulative: enamel specimens lost measurable mass starting from the first day of immersion in flavored sparkling water and continued losing mass over the following nine days.2Brazilian Dental Science. The long-term effect of sparkling flavored water on human tooth enamel determined by gravimetric analysis: a preliminary evaluation
The citric acid is especially problematic because it doesn’t just lower pH. It also chelates calcium, meaning it grabs onto the calcium in your enamel and pulls it out of the mineral structure. Brands like Dasani flavored water and Sparkling Ice both contain citrate in their formulations, which gives them this additional erosive edge beyond what pH alone would predict.3Open Journal of Stomatology. The pH and Titratable Acidity of Still and Sparkling Flavored Waters: The Effects of Temperature and Storage Time Even carbonated water without added flavoring can affect enamel that’s already been weakened or etched, though the damage was significantly less in formulations with added calcium ions.4PubMed Central. Effect of carbonated water manufactured by a soda carbonator on etched or sealed enamel
The practical takeaway: if you drink one flavored sparkling water with lunch, your teeth will be fine. If you sip three or four cans throughout the day, bathing your teeth in low-pH liquid for hours, you’re creating conditions for enamel erosion that plain water would never cause. Drinking it with meals rather than between them, using a straw, and rinsing with plain water afterward all reduce contact time with your enamel.
What Flavored Sparkling Water Actually Contains
Reading the label on a can of flavored sparkling water can be misleading. Many brands advertise “zero calories, zero sugar, no artificial sweeteners,” which sounds like the drink is just water with bubbles and a hint of fruit. In reality, the ingredient list often includes citric acid, natural flavors (a broad regulatory category that can encompass a wide range of compounds), and sometimes sweeteners like sucralose, stevia, or erythritol.
The sweetener question matters because not all zero-calorie sweeteners behave the same way in your body. A recent study comparing long-term consumption of different sweetened waters in rats found that sucralose produced effects similar to sucrose: it promoted the growth of harmful gut bacteria and worsened obesity-related metabolic markers. A natural sweetener called mogroside, by contrast, reduced obesity markers and encouraged beneficial gut bacteria.5Journal of Functional Foods. What exactly happens to rats that drink different types of sweetness water over a long time:A comparison with sucrose, artificial sweeteners and natural sweeteners That’s an animal study, so the findings don’t translate directly to people, but it’s a reminder that “zero sugar” doesn’t mean “biologically inert.” If your flavored sparkling water contains sucralose, it’s doing more in your gut than plain water would.
Brands that use only “natural flavors” and carbonation without added sweeteners or acids are closer to plain water in their effects, though even “natural flavors” can include compounds that subtly lower pH. The gap between one brand and another can be enormous, so lumping all flavored sparkling waters into a single category is misleading. A LaCroix with no sweetener and no citric acid listed on the label is a fundamentally different product from a Sparkling Ice with sucralose and citric acid, even though both occupy the same shelf.
How Carbonation Affects Your Stomach
The bubbles in sparkling water release carbon dioxide gas in your stomach, which causes distension. That’s the bloated, full feeling you get after drinking something fizzy. For most healthy people, this is temporary and harmless, but it’s worth understanding what’s happening underneath that sensation.
Carbonated water doesn’t speed up or slow down gastric emptying in a meaningful way. One study found that while carbonated water changed the distribution of food within the stomach, pushing more of the meal into the upper portion, the overall rate of emptying was identical to still water.6PubMed. Effect of carbonated water on gastric emptying and intragastric meal distribution A later study confirmed that even higher carbonation levels didn’t alter gastric volume or emptying rates despite temporarily expanding the stomach’s cross-sectional area in the first twenty minutes.7Nutrition. No influence of carbonation on glycemic response, gastric emptying, and satiety of sweetened drinks
Another study went further, testing whether sweetened carbonated drinks altered upper digestive tract function in healthy people. The answer was essentially no: gastric emptying, gallbladder contraction, and post-meal symptoms were unaffected by carbonation at various levels.8PubMed. Sweetened carbonated drinks do not alter upper digestive tract physiology in healthy subjects That said, carbonated beverages can temporarily reduce pressure at the lower esophageal sphincter, the muscular ring between your esophagus and stomach.9PubMed. Systematic review: the effects of carbonated beverages on gastro-oesophageal reflux disease If you already experience acid reflux, that relaxation can let stomach contents splash upward more easily. For people without reflux issues, the effect is typically too brief to notice.
The short-lived fullness from carbonation has a practical side. In a study of healthy young women, carbonated water produced significantly higher fullness scores than still water, likely driven by gastric distension stimulating nerve activity.10PubMed. The effects of carbonated water upon gastric and cardiac activities and fullness in healthy young women If you find that sparkling water makes you feel less hungry, that’s real, though the sensation fades quickly.
Does Carbonation Make You Hungrier?
One widely reported study complicates the fullness story. Researchers found that rats drinking carbonated beverages had higher levels of ghrelin, the hormone that signals hunger, and ate more food than rats drinking flat versions of the same drinks. A small parallel experiment in twenty healthy men found that ghrelin levels also rose after drinking carbonated beverages compared to still ones.11PubMed. Carbon dioxide in carbonated beverages induces ghrelin release and increased food consumption in male rats: Implications on the onset of obesity
This study got a lot of media attention, but it’s worth keeping in context. The human arm involved only twenty people, the effect was measured in the short term, and no follow-up studies have shown that habitual sparkling water drinkers actually gain weight as a result. The rat data are interesting mechanistically but don’t necessarily predict how your body responds to a can of sparkling water alongside a normal meal. The temporary fullness from gastric distension and the potential ghrelin bump may simply cancel each other out in practice. Researchers haven’t settled this question, and if you’re drinking unsweetened sparkling water, the caloric contribution is zero regardless of what your ghrelin does.
The Bone Health Myth
A persistent belief holds that carbonated drinks leach calcium from your bones. This fear is rooted in real observations about cola drinkers, but the mechanism behind cola’s association with lower bone density appears to be the phosphoric acid in cola, not the carbonation itself. Plain and flavored sparkling waters don’t contain phosphoric acid.
Research looking directly at the question has been reassuring. A study of older women found that bone mineral density was not associated with intake of any type of carbonated beverage after adjusting for other factors like calcium intake, exercise, and estrogen use.12PubMed Central. Carbonated beverage consumption and bone mineral density among older women: the Rancho Bernardo Study Another study had healthy postmenopausal women drink a liter of sodium-rich carbonated mineral water daily for eight weeks. Bone remodeling markers didn’t change, and calcium excretion was actually lower during the carbonated water period than during the control period.13British Journal of Nutrition. Bone remodelling is not affected by consumption of a sodium-rich carbonated mineral water in healthy postmenopausal women If sparkling water were harmful to bones, you’d expect to see the opposite.
So if someone has told you that your sparkling water habit is weakening your skeleton, the evidence doesn’t support that. The concern applies to cola specifically, and even there the relationship is debated.
Sparkling Water as a Soda Replacement
One of the most common reasons people reach for flavored sparkling water is to wean themselves off sugary soda. The fizz and the fruit flavor scratch a similar itch without the sugar load. On that basis alone, the switch is a clear improvement: you go from roughly 140 calories and 39 grams of sugar per can to zero of each.
A pilot study explored what happens when regular soda drinkers replace their soda with unsweetened flavored sparkling water for two weeks. Among participants who started out strongly preferring sweet tastes, liking ratings for soda actually decreased after the two-week swap, especially for the sweetest concentrations. Interestingly, participants with more moderate sweet preferences showed the opposite pattern, increasing their liking for lower sugar concentrations afterward.14PubMed. Secondary Analysis of Sweetness Liking from Pilot Study Replacing Sugar Sweetened Soda with Flavored, Unsweetened Sparkling Water The takeaway is that switching to sparkling water doesn’t uniformly recalibrate your sweet tooth, but for people who are strong sweet likers, it may genuinely reduce the appeal of sugary drinks over time.
That’s a more nuanced picture than the simple narrative that sparkling water “trains” you to want less sugar. Your individual relationship with sweetness matters. Still, even without a perfect sweetness recalibration, cutting out the sugar and calories from soda is a health win by any measure.
Kidney Stones and Urinary Chemistry
People prone to kidney stones are often told to drink more water, and the question naturally follows: does sparkling water count? It does, with one potential bonus. Some mineral waters, particularly those high in bicarbonate, can raise urinary pH and increase citrate excretion, both of which help prevent certain types of kidney stones. This effect is substantial enough that bicarbonate-rich mineral water has been discussed as a possible substitute for potassium citrate therapy, which is the standard pharmaceutical approach to alkalinizing urine in stone formers.15PubMed. Can the manipulation of urinary pH by beverages assist with the prevention of stone recurrence?
Not all sparkling waters are mineral waters, though. Most commercially popular flavored sparkling waters in cans are made from filtered tap water with added carbonation and flavoring, and they may contain very little bicarbonate or other minerals. If kidney stone prevention is your goal, you’d want to check the mineral content on the label or look specifically for brands that use a naturally mineral-rich source. The carbonation itself doesn’t help or hurt; it’s the dissolved mineral content that matters.
Microplastics in Bottled and Canned Sparkling Water
A concern that applies to all packaged beverages, not just sparkling water, is microplastic contamination. A study analyzing mineral water across different packaging types found microplastic particles in every sample, regardless of container. Returnable plastic bottles had the highest average contamination at around 118 particles per liter, while single-use plastic bottles averaged about 14 particles per liter. Even glass bottles contained microplastics, with some samples reaching over 250 particles per liter. Most of the particles in plastic bottles were made of PET, the same material as the bottle itself.16Water Research. Analysis of microplastics in water by micro-Raman spectroscopy: Release of plastic particles from different packaging into mineral water
A more recent study of beverages sold in France found broadly similar patterns but added an unexpected wrinkle: glass bottles were actually among the most contaminated containers, and bottle caps appeared to be a major source. The plastic and paint materials in caps were found in the beverage itself, and the particle composition matched cap materials rather than the container body.17Journal of Food Composition and Analysis. Microplastic contaminations in a set of beverages sold in France Waters in that study averaged about 3 particles per liter, far less than carbonated lemonades or beers, but the contamination was never zero.
Whether carbonation itself increases microplastic release from packaging hasn’t been conclusively established. The acidic environment of carbonated drinks could theoretically accelerate material degradation, but the available data don’t single out sparkling water as worse than other packaged beverages. If microplastics concern you, the container and its cap matter more than whether the water inside is still or sparkling.
Carbonation and Swallowing
One benefit of carbonated water that rarely comes up in casual conversation is its effect on swallowing. The sensory stimulation from carbonation activates receptors in the mouth and throat that can improve the timing and coordination of the swallowing reflex. Research using brain stimulation techniques found that swallowing carbonated liquid produced more correctly timed swallows than swallowing still water, and the improvement in the brain’s swallowing control centers lasted up to sixty minutes afterward.18PubMed. Brain and behavioral effects of swallowing carbonated water on the human pharyngeal motor system
This has practical relevance for older adults, who are more likely to experience weakened swallowing reflexes. A study of elderly hospital inpatients found that swallowing a carbonated beverage shortened certain phases of the swallowing process compared to cooled still water, though the overall improvements were modest and short-lived.19Physiology & Behavior. Effects of carbonated beverages on sustained swallowing behavior changes in older inpatients Carbonated beverages, including flavored sparkling waters, have been used in clinical settings to stimulate swallowing in patients recovering from strokes or dealing with other neurological conditions.20PubMed. Effect of carbonated beverages on pharyngeal swallowing in young individuals and elderly inpatients The mechanism involves the same trigeminal nerve receptors that give carbonation its tingly, slightly sharp mouthfeel. Those receptors aren’t activated by still water, which is one concrete physiological difference between the two drinks that has nothing to do with hydration or nutrition.