Replacing still water with sparkling water could help with weight loss alongside other steps, according to new research, with the fizz potentially fueling some essential biological processes that keep the body healthy.
The findings are the work of physician researcher Akira Takahashi of Tesseikai Neurosurgical Hospital in Japan, who wanted to take a closer look at claims that soft drinks could help people lose weight. However, as his published article shows, the measured effects are very small.
“The impact of CO2 in sparkling water is not a stand-alone solution for weight loss,” warns Takahashi. “A balanced diet and regular physical activity remain crucial elements of sustainable weight management.”
When we drink sparkling water, carbon dioxide (CO2) it enters our bloodstream. Red blood cells then convert it to bicarbonate, which reduces the acidity of the cells and then speeds up the use of glucose, meaning less sugar is left as fat.
To assess the impact of this chemical chain reaction and the subsequent acceleration of glucose metabolism, Takahashi analyzed figures reported for another process that puts CO2 in the body: hemodialysis.
This treatment of kidney disease aims above all to cleanse the blood and eliminate waste when the kidneys can no longer do so. As a result, this also introduces more CO2 into the bloodstream – which means it can also tell us about the effects of soft drinks.
During a typical four-hour hemodialysis session, about 48,000 milliliters of blood are processed, resulting in a reduction of about 9.5 grams of glucose. Given the much lower impact of drinking a glass of sparkling water, the weight impact is likely to be small.
“CO2 in sparkling water may promote weight loss by improving glucose absorption and metabolism in red blood cells,” writes Takahashi in his published article.
“However, the amount is so small that it is difficult to expect weight loss effects from CO alone.2 in sparkling water.”
The new research builds on previous studies suggesting that soft drinks also have no real impact on appetite – although drinking sparkling water is definitely a healthier choice than a carbonated soda with sugar.
Of course, When it comes to losing weight, a multitude of factors come into play – and these factors can be different for different people. It will always be important to watch what you eat and stay active, but healthcare professionals are the best people to help each of us develop an effective strategy.
Takahashi also highlights some of the problems that carbonated drinks can cause or exacerbate, which also need to be considered, including irritable bowel syndrome and gastroesophageal reflux disease.
“Drinking sparkling water may have some effects on the digestive system, especially in people with sensitive stomachs or pre-existing gastrointestinal issues,” writes Takahashi.
“Moderation is key to avoiding discomfort while still enjoying the possible metabolic benefits of sparkling water.”
The research was published in BMJ Nutrition Prevention & Health.
