Can Sparkling Water Boost Weight Loss?
The seltzer water world is having a moment. From berry blends to fruit punch, sparkling water is a calorie-free alternative to sugar and artificially sweetened beverages. A recent study suggests that fizzy water may slightly impact blood sugar and metabolism, but it’s no magic bullet for weight loss.
Carbonated water may minimally increase blood sugar uptake and metabolism, the way the body uses glucose to convert to energy. Unfortunately, the effect seems to be minimal. A recent analysis in the BMJ Nutrition Prevention and Health finds that sparkling water alone doesn’t lead to significant weight loss.
The researchers stress that losing weight and keeping it off isn’t that simple. Consistent exercise and a healthy, balanced diet remain key. Additionally, the long-term impact of drinking large amounts of fizzy water hasn’t been established.
The author stresses that there is no simple solution for losing weight and keeping it off. Regular exercise and a balanced, healthy diet remain essential. In addition, the long-term effects of consuming large amounts of carbonated water are still unclear.
Seltzer water is often considered a healthy tool for weight loss because it may help you feel full to reduce hunger. Additionally, it’s been suggested that it could speed digestion and help reduce blood sugar levels, leading some to see it as a possible weight loss trick.
Process Behind Blood Sugar Effects Unclear
The exact way that carbonated water may lower blood sugar isn’t clear (pun intended). It’s also murky how any such impact would confer meaningful weight-loss effects.
To evaluate this further, the study author compared drinking carbonated water to hemodialysis, a medical procedure where blood is filtered (dialyzed) to remove waste and excess fluid when the kidneys can no longer conduct this process. This comparison uses findings from earlier research.
Hemodialysis and Glucose Use
In hemodialysis, blood becomes more alkaline, primarily due to the carbon dioxide (CO2) production. In the same fashion, the CO2 in carbonated water is absorbed through the stomach lining and quickly changed into bicarbonate (HCO3) within red blood cells. This conversion to alkalinity may start up certain enzymes that increase the rate of glucose absorption and use in the body.
During dialysis, it’s been observed that blood glucose levels drop as blood moves through the dialyzer, despite the higher glucose level in the dialysate solution.
Why the Impact of Seltzer Water is Small
While these findings suggest that carbonated water could slightly improve how the body uses glucose, the total impact is very limited.
In a typical 4-hour hemodialysis treatment, roughly 48000 ml of blood passes through the dialyzer. This treatment results in about 9.5 g of glucose being used.
"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.
Potential Digestive Side Effects
The author also advises that seltzer water may impact the digestive system, particularly in individuals with sensitive stomachs or prior gastrointestinal issues.
He notes, "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-esophageal reflux disease”.
"Moderation is key to avoiding discomfort while still enjoying the possible metabolic benefits of carbonated water," he says.
Use Caution
Professor Sumantra Ray, Executive Director of the NNEdPro Global Institute for Food, Nutrition and Health, which co-owns the journal, advised that the data is preliminary.
He suggests, "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."
Below are practical weight loss tips:
· Swap sugar-sweetened beverages and artificially-flavored drinks with water, unsweetened tea, or carbonated water.
· Prioritize sleep. Poor sleep may lead to increased cravings and higher blood pressure, glucose, and cholesterol levels.
· Eat at regular intervals, with breakfast being your largest meal, lunch being smaller, and dinner the smallest.
· Include foods high in protein for satiety (eggs, low-fat dairy products, lean meats, beans, lentils, and soy-based products).
· Increase vegetable and fruit intake for fiber, vitamins, and minerals.
· Don’t eat your feelings. Ask yourself, “What’s eating me, that’s making me eat?”
· Snack less often to allow your gastrointestinal system some rest and a chance to use calories in storage.
· Move more. Even a 15-minute walk after meals is better than no movement.
· Include strength training a few days per week to build muscle and confidence.
· Avoid late-night eating. Brush your teeth after dinner to signal, “the kitchen is closed”.
· Pay attention to hunger and habit. If you’re truly hungry, would you eat a bowl of carrots or an apple? Or are you anxious, bored, sad, or procrastinating?
Lisa Andrews, MEd, RD, LD
Reference:
Akira Takahashi. Can carbonated water support weight loss? BMJ Nutrition, Prevention, 2025; 8 (1): 347 DOI: 10.1136/bmjnph-2024-001108