Sparkling water hydrates you just as well as still water. The carbonation (dissolved carbon dioxide) doesn’t interfere with your body’s ability to absorb the water, so every sip counts toward your daily fluid intake the same way flat water does. The only real differences between the two come down to comfort, dental considerations, and what else might be in the bottle.
Why Carbonation Doesn’t Change Hydration
Water is water, whether or not it has bubbles. When you drink sparkling water, the carbon dioxide gas that creates the fizz is released in your stomach and eventually exhaled through your lungs. What remains is plain water, which your body absorbs through the intestinal lining just like it would from a glass of tap water. Research from the National Library of Medicine confirms that sparkling water is just as hydrating as the non-carbonated kind.
This holds true regardless of which type of bubbly water you prefer. Seltzer is simply plain water carbonated with CO2. Club soda is carbonated water with added minerals. Sparkling mineral water comes from naturally carbonated underground springs and can contain calcium, magnesium, or sodium depending on the source. All three hydrate equally well.
The Exercise Exception
While sparkling water hydrates you on paper, it’s not ideal during a workout. The carbonation can cause bloating, gas, and a feeling of fullness that makes it harder to drink enough fluid when you’re sweating heavily. That uncomfortable stomach distention can also contribute to side stitches during running or other high-intensity movement. For everyday hydration at your desk, with meals, or throughout the day, sparkling water is a perfect substitute for still. But during exercise, flat water (or a sports drink if you’re going hard for over an hour) is the more practical choice.
Effects on Teeth
The carbonation process creates carbonic acid, which makes sparkling water slightly more acidic than flat water. Commercial sparkling waters typically have a pH between 4.18 and 5.87. For context, tooth enamel begins to dissolve at a pH below 5.5. So some sparkling waters sit right at or below that threshold.
That said, the erosive potential of plain sparkling water is far lower than sodas or fruit juices. One study that exposed extracted human teeth to sparkling water and regular lab water found the two were about the same in their effects on enamel. The real concern is flavored sparkling water. Citrus-flavored varieties often contain citric acid, which pushes the pH lower and meaningfully increases the risk of enamel erosion over time.
If you drink sparkling water regularly, a few simple habits help protect your teeth: choose unflavored varieties when possible, don’t swish the water around in your mouth, and avoid sipping continuously over long periods (which keeps acid levels elevated). Drinking it with meals rather than between them also helps, since the food stimulates saliva production that neutralizes acid.
It Won’t Weaken Your Bones
You may have heard that carbonated drinks leach calcium from your bones. This concern comes from studies on cola, not sparkling water. A community-based study of older women published in the American Journal of Public Health found no association between carbonated beverage consumption and bone mineral density after adjusting for age, obesity, calcium intake, exercise, and other factors. The researchers concluded that modest intake of carbonated beverages does not appear to have adverse effects on bone density. The phosphoric acid in cola is a separate issue from the carbon dioxide in sparkling water.
Potential Digestive Benefits
Carbonated water may actually offer a few digestive perks that still water doesn’t. Research has found that it can promote feelings of fullness and stimulate gastric motility, which is the movement of food through your digestive tract. Some people find that a glass of sparkling water after a meal eases indigestion or that uncomfortable “too full” sensation. The satiety effect could also be useful if you’re trying to manage your weight, since feeling fuller may reduce the urge to snack. However, the same bloating that makes it impractical during exercise can be uncomfortable for people with irritable bowel syndrome or acid reflux. If carbonation triggers discomfort for you, that’s a good reason to stick with still water.
What to Watch on the Label
Plain sparkling water, seltzer, and sparkling mineral water are all fine choices with zero calories and no sugar. But not everything marketed as sparkling water is equally straightforward. Here’s what to look for:
- Sodium: Club soda contains added minerals, often including sodium. If you’re watching your salt intake, check the nutrition label or choose seltzer instead.
- Citric acid and natural flavors: Flavored sparkling waters are more acidic than plain varieties. They’re still far better for your teeth than soda, but they’re not as gentle as unflavored options.
- Added sweeteners: Some brands add sugar, artificial sweeteners, or sugar alcohols. If the label lists anything beyond water, carbonation, and natural flavors, you’re moving into soft drink territory.
If you enjoy sparkling water and it helps you drink more fluid throughout the day, it’s doing exactly what it should. The hydration is identical to still water, the bone health concerns are unfounded, and the dental effects of plain varieties are minimal. For most people, the biggest practical benefit is simple: if the bubbles make water more appealing, you’ll drink more of it.