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  • Fizzy water might aid...

Fizzy water might aid weight loss by boosting glucose uptake and metabolism: Study

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2025-01-29T07:45:07+05:30  |  Updated On 29 Jan 2025 11:45 AM IST
Fizzy water might aid weight loss by boosting glucose uptake and metabolism: Study
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Fizzy water might aid weight loss by boosting blood glucose uptake and metabolism-the rate at which the body uses and converts energy-but the effects are so small, drinking it can’t be relied on alone to shed the pounds, concludes a brief analysis published in the open access journal BMJ Nutrition Prevention & Health.

There are no quick fixes to slimming down and keeping off the weight, says the author: regular physical activity and a healthy balanced diet are still essential, added to which the long term effects of drinking large amounts of carbonated water aren’t known.

Because fizzy water is ‘filling,’ thereby helping to curb hunger pangs, and reportedly speeds up digestion and lowers blood glucose levels, it has been heralded as a potential slimming aid.

But it’s not clear exactly how carbonated water might reduce blood glucose or how this might contribute to weight management, points out the author.

To try and find out, the author compared the process of drinking fizzy water with haemodialysis, whereby blood is filtered (dialysed) to remove waste and excess water when the kidneys no longer can, drawing on previously published research.

Haemodialysis turns blood alkaline, primarily producing carbon dioxide (CO₂). Similarly, the CO₂ of fizzy water is absorbed through the stomach lining and is rapidly converted to bicarbonate (HCO3) in red blood cells. This alkalinisation process speeds up glucose absorption and use by activating key enzymes in red blood cells, explains the author.

Clinical observations during haemodialysis show that blood glucose levels fall as blood passes through the dialyser, despite a higher glucose level in the dialysate solution to start with, he adds.

While these findings suggest that fizzy water may indirectly promote weight loss by enhancing the uptake and use of blood glucose, context is key, emphasises the author.

During a typical 4 hour haemodialysis session around 48000 ml of blood flows through the dialyser, resulting in around 9.5 g of glucose being used during the session, he explains.

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

“Also, drinking carbonated water can have some effects on the digestive system, particularly for individuals with sensitive stomachs or pre-existing gastrointestinal conditions. The primary concerns include bloating, gas and, in some cases, exacerbation of certain symptoms associated with digestive disorders, such as irritable bowel syndrome or gastro-oesophageal reflux disease,” he points out.

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

Commenting on the analysis, Professor Sumantra Ray, Executive Director, NNEdPro Global Institute for Food, Nutrition and Health, which co-owns the journal, said: “While there is a hypothetical link between carbonated water and glucose metabolism this has yet to be tested in well designed human intervention studies.

“And although this study adds to the evidence base, it doesn’t provide sufficient evidence on which to make recommendations for the preventive or therapeutic use of carbonated water. Additionally, any potential benefits must be weighed up against the potential harms of carbonated drinks which may contain sodium, glucose, or other additives.”

BMJ Nutrition Prevention & Healthweight lossblood glucosemetabolism
Source : BMJ Nutrition Prevention & Health
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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