Contrary to recent claims, sparkling water is unlikely to aid in weight loss. A hypothesis suggests that it may boost metabolism and blood sugar uptake, but the science behind this theory needs further investigation.
The idea originated from a 2004 study on haemodialysis, which found that carbon dioxide can lower blood glucose levels by increasing the pH inside red blood cells. However, this study was not looking at the effect of sparkling water on body weight and did not consume fizzy water during the experiment.
To understand whether this hypothesis stands, research is needed to investigate how much carbon dioxide enters the bloodstream when drinking sparkling water, and how quickly it’s absorbed by the body. A glass of sparkling water contains less than a gram of carbon dioxide, which will be absorbed in minutes.
The author of the hypothesis warns that fizzy water alone cannot lead to significant weight loss and emphasizes the importance of a balanced diet and regular exercise for effective weight management. Experts agree that while sparkling water may not have a measurable effect on metabolism, it can still contribute to calorie reduction if used as a replacement for sugary drinks.
While some studies suggest that fizzy water may help with appetite suppression, the evidence is inconclusive. Research in rats found that sparkling water increased hunger hormones, and human studies showed no significant difference in appetite or feeling full between fizzy and still water. The author suggests that further research is needed to understand how carbonated beverages affect hunger and satiety.
Source: https://www.thenewdaily.com.au/life/eat-drink/2025/02/02/sparkling-water-weight-loss