Carbonated drinks do not help with gas. They actively make it worse. The carbon dioxide dissolved in every fizzy beverage releases gas directly into your stomach, increasing its volume and contributing to the bloating and discomfort you’re trying to relieve. The American College of Gastroenterology specifically recommends that people dealing with gas, bloating, or flatulence eliminate carbonated beverages entirely.
What Carbonation Does Inside Your Stomach
When you drink something carbonated, dissolved carbon dioxide escapes from the liquid as it warms to body temperature. That released gas has to go somewhere. A study published in Nutrition Journal measured what happens using stomach imaging: after drinking just 300 ml (about 10 ounces) of a carbonated beverage, total gastric volume increased by roughly 250 ml compared to the same drink without carbonation. The extra volume was almost entirely gas.
Your stomach physically expands to accommodate that gas. Imaging showed the upper portion of the stomach becoming visibly enlarged after carbonation. This mechanical stretching is one of the key signals your body uses to register fullness and discomfort. The stronger the distension, the stronger the bloating sensation. Research found that bloating correlated most strongly with total gastric volume, with a statistically significant relationship in both men and women.
There is one small consolation: the distension from carbonation can be short-lived. Your stomach wall absorbs some of the gas, and the rest tends to escape quickly through belching. But that belching itself can become a problem, because it trains a cycle of swallowing air and releasing it that perpetuates discomfort rather than resolving it.
Why Belching Doesn’t Equal Relief
It’s tempting to think that a good burp clears out trapped gas, and that carbonation helps trigger that burp. There’s a kernel of logic there, but it doesn’t hold up. Carbonated drinks are listed by the Mayo Clinic alongside chewing gum, eating too fast, and smoking as behaviors that introduce excess air into the digestive tract. You’re adding far more gas than you’re releasing.
The belching triggered by carbonation also relaxes the valve between your esophagus and stomach. In a controlled study of healthy people, drinking a carbonated beverage cut the resting pressure of that valve by more than half, dropping from a median of 40.5 mmHg to 18.5 mmHg. At the same time, the frequency of spontaneous valve relaxations jumped dramatically compared to drinking plain water. This is the mechanism behind acid reflux, which means carbonation can layer heartburn on top of your existing gas problems.
Carbonation Doesn’t Speed Digestion
Another common belief is that sparkling water helps move food through your system faster, reducing the time gas has to build up. Research published in Digestive Diseases and Sciences tested this directly, comparing gastric emptying after meals consumed with carbonated water versus still water. The result: emptying of both solid and liquid portions of the meal was identical for both drinks. Carbonation changed how the meal distributed itself within the stomach but did not speed anything along.
Diet Sodas Can Make Gas Even Worse
If you’re reaching for a diet soda, you may be dealing with a double hit. Beyond the carbonation itself, many sugar-free drinks contain sugar alcohols as sweeteners. Sorbitol (also called d-glucitol) is one of the most common, and it is extensively fermented by gut bacteria in your colon. That fermentation produces gas directly in the lower digestive tract, which means more flatulence and cramping rather than just stomach bloating.
Not all sugar alcohols are equally problematic. Erythritol, used in some newer diet beverages, is not fermented by intestinal bacteria and tends to cause fewer symptoms. But sorbitol, mannitol, maltitol, and xylitol all have well-documented potential to cause gas, bloating, and even osmotic diarrhea when consumed in moderate amounts. If you’re already dealing with gas, checking ingredient labels for these sweeteners is worth the effort.
What Actually Helps With Gas
The behavioral changes that reduce gas are less satisfying than cracking open a can of seltzer, but they work. Eating more slowly, chewing with your mouth closed, and avoiding straws all reduce the amount of air you swallow. These are the same mechanisms behind carbonation-induced bloating, just in reverse.
On the dietary side, common gas producers include beans, lentils, broccoli, cauliflower, cabbage, onions, mushrooms, and whole-grain foods. These contain carbohydrates that your small intestine can’t fully break down, so bacteria in your colon ferment them and produce gas. Reducing or rotating these foods can meaningfully lower your baseline gas production.
Walking after meals helps move gas through the intestines. Gentle physical activity stimulates the natural contractions of your digestive tract, making it easier for trapped gas to pass rather than accumulate. Even 10 to 15 minutes of light movement after eating can make a noticeable difference.
If you enjoy the sensation of sparkling water and don’t experience much bloating from it, occasional consumption is unlikely to cause harm. But if you’re searching for something to relieve gas you already have, a carbonated drink will reliably add to the problem rather than solve it.