Does sparkling water break a fast?
Plain carbonated water fits an ordinary fasting window. Check flavoured versions for added ingredients.
By FastWindowTimer · Content updated: · Not individually medically reviewed — see editorial policy
What the answer can tell you
Each row is specific to this item. An eating-rule verdict does not establish a biological outcome.
| Goal | How to read this verdict |
|---|---|
| Weight loss / calories | A calorie-free drink differs from a sweetened sparkling beverage. |
| Metabolic / insulin | Carbonation alone cannot establish your insulin response. |
| Water-only / procedure rules | Carbonation may not suit your comfort; a water-only instruction may specify still water. |
| Autophagy: evidence limit | The cited source does not establish a dose of sparkling water that preserves human autophagy. The timer cannot measure it. |
Serving and calories
0 kcal for water with carbonation alone.
What to check in practice
Carbonation adds no food energy. Tonic water, soda and sparkling juice are different products. Use the nutrition label when a flavour or sweetener is added.
Does it depend on your fasting goal?
These verdicts describe eating rules, not a measured biological switch. Medical-test instructions and prescribed care take priority.
Compare related items
Frequently asked questions
- Is tonic water the same as sparkling water?
- No. Compare the ingredients and energy on the label. A drink containing sugar cannot be treated as plain water just because it is clear and carbonated.
Sources
- Healthline — Is Carbonated (Sparkling) Water Good or Bad for You? (opens in a new tab)
What this source supports: Describes plain carbonated water and distinguishes added ingredients.
What it cannot establish: No personal insulin, ketone or autophagy measurement; product-specific values must come from its label.
Source checked: