Sparkling water may slightly boost how the body processes blood sugar and energy, but not enough to drive real weight loss, according to a brief analysis published in BMJ Nutrition Prevention & Health on April 17, 2026.
How carbonated water affects glucose metabolism
The carbon dioxide in sparkling water is absorbed through the stomach lining and rapidly converted to bicarbonate in red blood cells, making the blood more alkaline. This alkalinisation process speeds up glucose absorption and use by activating key enzymes in red blood cells, similar to what occurs during hemodialysis.
Why the weight loss effect is minimal
Although hemodialysis uses about 48,000 ml of blood over four hours to reduce glucose by roughly 9.5 g, the equivalent effect from drinking carbonated water is far too small to meaningfully impact weight loss. The author stresses that there is no simple solution for losing weight and keeping it off, and regular exercise and a balanced, healthy diet remain essential.
Additional considerations and limitations
Sparkling water may create a feeling of fullness that could reduce hunger, and it has been suggested to speed up digestion, but the exact way it lowers blood glucose is not well understood. The long term effects of consuming large amounts of carbonated water are still unclear, and it can affect the digestive system, especially in people with sensitive stomachs or existing gastrointestinal issues.
Can sparkling water alone help with weight loss?
No, the analysis concludes that carbonated water alone is not enough to drive meaningful weight loss.
Is it safe to drink sparkling water every day?
The long term effects of consuming large amounts of carbonated water are still unclear, and it may affect the digestive system in people with sensitive stomachs or gastrointestinal issues.