Drinking plain sparkling water is not bad for you. It hydrates just as well as still water, doesn’t weaken your bones, and is safe for daily consumption. Most of the health concerns people associate with carbonated drinks actually come from sodas, not from carbonation itself. That said, there are a few situations where the bubbles can cause real discomfort.
Sparkling Water Hydrates as Well as Still Water
One of the most common worries is that sparkling water somehow doesn’t “count” as real hydration. It does. A randomized trial published in the American Journal of Clinical Nutrition tested 13 commonly consumed drinks on 72 men and developed a Beverage Hydration Index to compare them. Plain water and seltzer scored equally, meaning your body retains the same amount of fluid from both.
If you find it easier to drink more water when it’s fizzy, that’s a net positive. Staying well-hydrated matters more than whether your water has bubbles in it.
The Bone Health Concern Is Mostly a Myth
The idea that carbonated water weakens bones has been floating around for years, but it comes from a misunderstanding. The real culprit is phosphoric acid, an ingredient found in colas, not in plain sparkling water. Plain club soda contains less than 1 mg of phosphorus per serving. Compare that to Coca-Cola at 58 mg, Pepsi at 53 mg, and Dr. Pepper at 54 mg.
Researchers at Tufts University examined bone mineral density data from roughly 2,500 men and women in the Framingham Osteoporosis Study. Non-cola carbonated drinks showed no association with low bone density. Cola was linked to lower hip bone density in women, but that connection traces back to phosphoric acid and possibly the fact that heavy cola drinkers tend to consume less milk and calcium overall.
A clinical trial published in the British Journal of Nutrition followed healthy postmenopausal women (a group especially vulnerable to bone loss) 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 mineral water. In short, the carbonation itself isn’t the problem.
How Carbonation Affects Your Stomach
This is where sparkling water can genuinely bother some people. Carbon dioxide creates carbonic acid in water, which is a weak acid. For most people, this causes nothing more than a bit of burping. But if you have acid reflux or GERD, the picture is more complicated.
Some studies show that carbonated beverages can temporarily reduce pressure at the valve between your esophagus and stomach, which is exactly the mechanism that allows acid to splash upward. A 2010 systematic review found that carbonated drinks could acutely lower the pH inside the esophagus and increase the rate of those valve relaxations. Cross-sectional research also suggests that people with GERD are about twice as likely to consume carbonated beverages compared to healthy individuals, and that intake is associated with worsening reflux symptoms.
The research isn’t perfectly consistent. Some studies found no increase in reflux episodes from carbonation alone. But if you already experience heartburn or a sour taste in the back of your throat after meals, sparkling water could make things worse. It’s worth testing: skip the bubbles for a couple of weeks and see if your symptoms improve.
People with irritable bowel syndrome or chronic bloating may also find that carbonated water increases gas and abdominal discomfort, simply because you’re swallowing dissolved gas that needs to go somewhere.
Sparkling Water and Appetite
One small animal study linked carbonated water to higher levels of ghrelin, a hormone that stimulates hunger. This made headlines but hasn’t been replicated in human studies. The general finding in people goes the other direction: sparkling water can help you feel fuller, at least temporarily, because the gas expands your stomach slightly. If you’re using sparkling water between meals to curb snacking, that strategy is reasonable.
What About Additives and Contaminants
Plain sparkling water, seltzer, and club soda are essentially just water and carbon dioxide (club soda adds a small amount of minerals for flavor). These are fine. The problems start when brands add citric acid, natural flavors, or sweeteners. Citric acid flavored sparkling waters are more acidic and, over time, can erode tooth enamel more than plain carbonated water. If you drink flavored varieties regularly, using a straw and not sipping over long periods can help protect your teeth.
As for contaminants like PFAS (sometimes called “forever chemicals”), the FDA tested 197 bottled water samples collected from U.S. retail locations between 2023 and 2024. Only ten had detectable PFAS levels, and none exceeded the maximum contaminant limits the EPA has set for public drinking water. While the testing covered bottled water broadly rather than sparkling water specifically, the results suggest that commercially bottled water products are generally within safe limits.
Who Should Be Cautious
For most people, sparkling water is a perfectly healthy substitute for still water and a far better choice than soda or juice. But a few groups should pay attention:
- People with GERD or frequent heartburn may find carbonation triggers or worsens symptoms.
- People prone to bloating or IBS could experience more gas and discomfort.
- Frequent sippers of citrus-flavored sparkling water should be mindful of dental erosion over time.
If none of those apply to you, there’s no reason to worry about your sparkling water habit. The carbonation itself is harmless, it hydrates you just as effectively, and the bone health scare doesn’t hold up when you separate sparkling water from cola.