In this article
Editorial update: September 29, 2026. Text prepared with AI support from the indicated sources. No independent clinical review. General information, not an individual meal plan.
Short answer
Yes. Sparkling water is water with carbon dioxide, no sugar: based on the USDA, club soda has 0 g of carbohydrate per 100 g. The caution is with similar drinks that contain sugar.
Sparkling water and similar drinks
| Food | Total carbohydrate (g) | Source |
|---|---|---|
| Sparkling water (club soda) | 0.0 | USDA |
| Tonic water-type soda | 8.0 | TACO |
| Cola-type soda | 8.7 | TACO |
Tonic water is a different drink: a soda, with 8.0 g of carbohydrate per 100 g.
What to check on the label
Flavored sparkling water may contain sugar or juice; the Harvard Nutrition Source lists added and natural sugars in foods and drinks among what keto avoids, so check carbohydrates on the nutrition label. If the drink uses sweeteners, see what the WHO says about them in zero soda on the keto diet. Sodium is also worth checking: USDA club soda has 21 mg per 100 g; in sparkling mineral water, the value is on the label.
If you have high blood pressure, kidney disease, diabetes, or take medication, talk to a doctor before changing your diet. Also worth reading: the risks and precautions of the ketogenic diet.
Sources
- Harvard T.H. Chan School of Public Health, The Nutrition Source: Diet Review: Ketogenic Diet for Weight Loss
- U.S. Department of Agriculture (USDA), FoodData Central, SR Legacy database
- TACO – Brazilian Food Composition Table, 4th revised and expanded edition (NEPA/Unicamp)
- World Health Organization (2023): WHO advises not to use non-sugar sweeteners for weight control
Mariana is passionate about a healthy lifestyle.
