Do Carbonated Drinks Cause Dyspepsia?
Carbonated beverages can trigger dyspeptic symptoms in susceptible individuals, particularly those with postprandial distress syndrome (PDS), but they do not universally cause functional dyspepsia and may even improve symptoms in some patients.
The Evidence Shows Mixed Effects
The relationship between carbonated drinks and dyspepsia is more nuanced than a simple cause-and-effect:
Carbonated Drinks as Symptom Triggers
In patients who already have functional dyspepsia, carbonated beverages are among the most commonly reported symptom-triggering foods. A study of 168 FD patients found that 21.8% identified carbonated drinks as causing dyspeptic symptoms 1. Importantly, this effect was more pronounced in the postprandial distress syndrome (PDS) subgroup, where 37.3% reported symptoms from carbonated drinks, compared to only 22.1% in the epigastric pain syndrome (EPS) subgroup 1.
Carbonated Water May Actually Improve Dyspepsia
Paradoxically, a randomized controlled trial demonstrated the opposite effect: carbonated water significantly reduced dyspepsia scores (from 7.9 to 5.4, p<0.05) in patients with functional dyspepsia and constipation 2. The same study showed carbonated water improved gallbladder emptying and reduced satiety 2. This suggests that naturally carbonated or plain carbonated water may differ from commercial carbonated soft drinks in their effects.
Mechanism: Gastric Distension Without Delayed Emptying
The physiological effects help explain both perspectives. Carbonated water causes greater retention of food in the proximal stomach (74% vs 56% for solids) without actually delaying overall gastric emptying 3. This proximal gastric distension may trigger symptoms in patients with visceral hypersensitivity—a hallmark of functional dyspepsia 4—while potentially benefiting gastric function in others.
Clinical Approach
For Patients With Existing Dyspepsia
Identify individual triggers: The 2022 BSG guidelines emphasize that "certain foods may trigger symptoms" and recommend lifestyle changes including "avoiding certain foods" 4. However, they explicitly state "there is no evidence for any specialised diets for treating FD" 4.
Trial elimination in PDS patients: Given the higher prevalence of carbonated drink sensitivity in PDS (37.3%), consider a 2-week trial of avoiding carbonated beverages in these patients 1.
Avoid overly restrictive diets: The BSG guidelines warn that "restricting diet too much could lead to malnutrition or abnormal eating habits" 4.
For Prevention
Carbonated beverages do not cause functional dyspepsia de novo in healthy individuals. The condition arises from "issues with the two-way communication between the upper gut and the brain" 4, not from dietary factors alone.
Important Caveats
- Type of carbonated beverage matters: Plain carbonated water may differ from sugar-sweetened or artificially sweetened carbonated soft drinks in their effects
- Individual variation is substantial: Only about 1 in 5 FD patients report carbonated drinks as triggers 1
- Symptoms require gastric volumes >300 mL: Gastric mechanical distress from carbonation appears only with larger volumes 5
The most recent Italian guidelines (2025) note that consensus was not reached regarding specific dietary regimens for FD, reinforcing that dietary triggers are highly individual 6.