Many people report that carbonated water feels more filling than still water. The question is whether that sensation reflects a measurable physiological effect or simply perception.
A 2012 study published in the Journal of Nutritional Science and Vitaminology examined whether carbonated water influences fullness, gastric activity, and heart rate compared to still water under controlled conditions.
What the Research Says
This was a controlled crossover study involving 19 healthy young women. Each participant completed three separate trials after an overnight fast.
During each trial, participants consumed:
- Still water (W)
- Carbonated water (CW)
- No drink (control)
Researchers assessed responses over a 60-minute period, including:
- Subjective fullness using visual analog scales (VAS)
- Gastric activity via electrogastrography (EGG)
- Heart rate (HR)
Measurements were taken before consumption and for up to 40 minutes afterward.
Key Findings
1. Modest Increase in Fullness
Carbonated water produced a statistically significant increase in reported fullness compared to still water. This effect was most noticeable in the short term, particularly within the first 20 to 40 minutes after ingestion.
2. Changes in Gastric Activity
Gastric electrical activity increased following both still and carbonated water consumption. While carbonated water showed some differences in activity patterns, these changes were subtle and not consistently distinct across all measurements.
3. Elevated Heart Rate
Heart rate was significantly higher following carbonated water compared to still water. Regression analysis suggested that this increase in heart rate was associated with the higher fullness ratings observed.
What This Means
This study suggests that carbonated water can produce a modest, short-term increase in feelings of fullness compared to still water.
The effect appears to be associated with a combination of factors, including gastric distension and changes in autonomic activity, although the exact mechanism is not fully established.
Importantly, the magnitude of this effect is relatively small and temporary.
Key Takeaways
- Carbonated water increased short-term fullness compared to still water
- The effect was statistically significant but modest in magnitude
- Changes in heart rate were associated with increased fullness ratings
- Gastric activity increased after both water types, with limited consistent differences
- Effects were short-lived, occurring within approximately 40 minutes
How to Apply This
- Carbonated water may be a useful option for individuals who prefer a greater sensation of fullness between meals
- The effect is short-term and should be viewed as a minor adjustment rather than a primary strategy
- Unsweetened carbonated water can support hydration without adding calories
- Individual tolerance varies, particularly for those sensitive to carbonation
Final Perspective
This study highlights a broader principle in nutrition and performance:
Small inputs can produce measurable physiological responses.
While the effect of carbonated water on fullness is modest, it reflects how subtle changes in fluid composition can influence perception and behavior. Over time, these small factors can contribute to overall dietary patterns and adherence.
References
Wakisaka, S., Nagai, H., Mura, E., Matsumoto, T., Moritani, T., & Nagai, N. (2012).
The effects of carbonated water upon gastric and cardiac activities and fullness in healthy young women.
Journal of Nutritional Science and Vitaminology, 58(5), 333–338.
https://doi.org/10.3177/jnsv.58.333
Educational Disclaimer
This article summarizes peer-reviewed scientific research for informational purposes only. It does not provide medical or nutritional advice. Always consult a qualified healthcare professional before making changes to your diet, training program, or supplementation routine.
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