The surprising link between sparkling water, metabolism and weight loss

One study examines the role of sparkling water in weight loss, suggesting it may improve glucose metabolism similar to the effects seen in hemodialysis.

However, the benefits are minimal and cannot replace the fundamental pillars of weight management of diet and exercise.

The role of sparkling water in weight loss

A new analysis published today (January 22) in BMJ Nutrition, Prevention & Health suggests that carbonated sparkling water may promote weight loss by slightly improving blood sugar absorption and metabolism, the process by which the body converts energy. However, the effects are minimal, meaning sparkling water alone is not a reliable solution for weight loss.

According to the author, there is no shortcut to effective weight loss. Regular physical activity and a balanced diet remain essential, and the long-term effects of high consumption of sparkling water are still unknown.

Potential Mechanisms of Sparkling Water

Sparkling water is often considered a potential weight loss aid because it can create a feeling of fullness, helping to reduce hunger, and is thought to speed up digestion and lower blood sugar.

However, the author points out that the exact mechanisms by which sparkling water might reduce blood sugar and promote weight management are not yet fully understood.

To try to find out, the author compared the process of drinking sparkling water with hemodialysis, whereby blood is filtered (dialyzed) to remove waste and excess water when the kidneys cannot. more, building on previously published research.

Comparative analysis with hemodialysis

Hemodialysis makes blood alkaline, producing mainly carbon dioxide (CO₂). Likewise, CO₂ of carbonated water is absorbed through the stomach lining and is quickly converted to bicarbonate (HCO₃) in red blood cells. This alkalization process speeds up the absorption and use of glucose by activating key enzymes in red blood cells, the author explains.

Clinical observations during hemodialysis show that blood glucose levels decrease as blood passes through the dialyzer, despite a higher glucose level in the dialysate solution initially, he adds.

Minimal impact on weight loss

Although these results suggest that sparkling water may indirectly promote weight loss by improving blood glucose uptake and utilization, context is key, the author points out.

During a typical 4-hour hemodialysis session, about 48,000 ml of blood flows through the dialyzer, resulting in about 9.5 g of glucose being used during the session, he explains.

“Given this minimal reduction in glucose, the impact of CO₂ in sparkling water is not a stand-alone solution for weight loss. A balanced diet and regular physical activity remain crucial elements of sustainable weight management,” he insists.

“Additionally, drinking sparkling water may have some effects on the digestive system, especially in people with sensitive stomachs or pre-existing gastrointestinal issues. The main concerns are bloating, gas and, in some cases, the exacerbation of certain symptoms associated with digestive disorders, such as irritable bowel syndrome or gastroesophageal reflux disease,” he emphasizes.

Conclusion and expert comments

“Moderation is key to avoiding discomfort while enjoying the possible metabolic benefits of sparkling water,” he says.

Commenting on the analysis, Professor Sumantra Ray, executive director of the NNEdPro Global Institute for Food, Nutrition and Health, co-owner of the journal, said: “Although there is a hypothetical link between sparkling water and glucose metabolism , this has not yet been tested. in well-designed human intervention studies.

“And while this study adds to the evidence base, it does not provide sufficient evidence on which to base recommendations for the preventive or therapeutic use of sparkling water.” Additionally, any potential benefits must be weighed against the potential harms of soft drinks that may contain sodium, glucose, or other additives.

Reference: “Can sparkling water promote weight loss? » January 22, 2025, BMJ Nutrition Prevention & Health.
DOI: 10.1136/bmjnph-2024-001108