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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
Carbonated water has no calories, no dissolved sugar, no alcohol, and no caffeine. It hydrates, just like plain water does. Drinking seltzer, club soda, or sparkling mineral water will not leach calcium from your bones, strip the enamel off your teeth, or make your thighs look like cottage cheese. Unless you have a medical condition that specifically precludes drinking carbonated beverages, enjoy it if so inclined.