San Pellegrino hydrates you just as well as still water. Sparkling water, including naturally carbonated mineral waters like San Pellegrino, counts fully toward your daily fluid intake and produces virtually identical hydration outcomes when compared to flat water in controlled studies.
Sparkling Water Scores the Same as Still Water
A widely cited study published in The American Journal of Clinical Nutrition developed what researchers call a Beverage Hydration Index, measuring how much fluid your body retains two hours after drinking various beverages compared to plain still water. Sparkling water produced no measurable difference in cumulative urine output at four hours compared to still water. In practical terms, your body holds onto the same amount of fluid whether the water has bubbles or not.
The carbon dioxide in sparkling water does interact with your digestive system. It stimulates gastric motility, meaning your stomach churns a bit more actively. Some research suggests this can actually speed up how quickly water moves into the small intestine, where most absorption happens. None of these effects reduce how much water your body ultimately absorbs.
Carbonation Can Make You Drink Less
The one indirect way sparkling water could affect hydration is through volume. Carbonation creates a feeling of fullness. Research published in the British Journal of Nutrition found that people who drank highly carbonated beverages felt significantly more satiated than those who drank lightly carbonated ones. Women consumed about 28% less food (by weight) at their next meal after a highly carbonated drink, and men consumed about 14% less.
Interestingly, the study found no difference in how much non-carbonated water people drank at lunch regardless of how fizzy their earlier beverage had been. So carbonation doesn’t seem to suppress your thirst for water later. But if the fullness from sparkling water makes you stop drinking sooner in the moment, you could end up taking in less total fluid in a single sitting. The fix is simple: just drink more throughout the day if you notice you’re sipping smaller amounts at a time.
What About the Minerals?
San Pellegrino is a mineral water, which means it contains naturally occurring dissolved minerals from its source in the Italian Alps. A liter contains about 31 mg of sodium and 2.2 mg of potassium. For context, a typical sports drink contains around 450 mg of sodium per liter. San Pellegrino’s mineral content is too low to meaningfully replace electrolytes lost through heavy sweating, but it does contribute trace amounts that plain filtered water wouldn’t.
If you’re exercising intensely or spending long stretches in heat, San Pellegrino alone won’t replace what you’re losing. For everyday hydration at a desk, during meals, or with light activity, it works perfectly well.
Is It Hard on Your Teeth?
A common concern with sparkling water is acidity and tooth enamel. San Pellegrino has an initial pH of about 5.17 right after opening, which is mildly acidic. For comparison, orange juice sits around 3.5 and regular soda around 2.5 to 3.5. Once the carbonation escapes (as it does fairly quickly once you drink it), the pH rises to nearly 7.9, which is essentially neutral.
Researchers who tested the erosive potential of various carbonated waters found that they posed significantly less risk to enamel than carbonated soft drinks. San Pellegrino, with its very low titratable acidity, ranked among the least erosive options. You’d need to be sipping it constantly throughout the day, keeping your teeth bathed in mild acid for hours, before it became a realistic concern.
How It Compares to Other Drinks
The Beverage Hydration Index study tested a range of common beverages. Cola, diet cola, hot tea, iced tea, coffee, lager, orange juice, sparkling water, and sports drinks all produced fluid retention comparable to still water at the four-hour mark. The beverages that performed notably better than water were oral rehydration solutions and milk, both of which contain higher levels of sodium, potassium, or protein that slow fluid loss through urine.
San Pellegrino falls squarely in the middle of this spectrum. It hydrates like water because it is water, just with dissolved CO2 and a small mineral profile. The bubbles don’t help hydration, but they don’t hurt it either.
Making It Work for Daily Hydration
If you prefer the taste and texture of San Pellegrino over tap water, drinking it throughout the day is a perfectly effective hydration strategy. A few things worth keeping in mind:
- Temperature matters more than carbonation. People tend to drink more water when they enjoy the temperature. If cold sparkling water gets you to drink more than room-temperature tap water, the net effect on hydration is positive.
- Watch for flavored versions. Plain San Pellegrino mineral water contains no sugar or calories. The brand’s flavored line (Essenza and the fruit sodas) may contain added sugars or sweeteners, which change the equation.
- Bloating is normal. Some people experience mild bloating or burping from carbonated water. This is just the CO2 releasing in your stomach and has no bearing on how well you’re hydrated.
For the vast majority of people in everyday situations, reaching for a San Pellegrino is functionally identical to reaching for a glass of tap water. Your body absorbs the same amount of fluid, retains it at the same rate, and stays equally hydrated.