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Neither diet soda nor sparkling water is proven to produce more weight loss than the other. Plain, unsweetened sparkling water is a low-calorie option; diet soda may help if it replaces sugary soda and lowers the calories you drink. The useful comparison is what each drink replaces and whether the choice helps you sustain an overall calorie reduction.
How the drinks compare for weight loss
| Choice | What it contributes | Most relevant use |
|---|---|---|
| Plain, unsweetened sparkling water | A low-calorie fizzy drink; CDC lists sparkling water and seltzer among low-calorie choices. Check the label, since sweetened products can differ. CDC | If you want fizz without sugar or non-sugar sweeteners, or want to replace a sugary drink. |
| Diet soda | Usually contains little or no sugar and may use high-intensity sweeteners such as sucralose, aspartame or saccharin. Ingredients vary; check the product label. CDC | If you enjoy sweet drinks and use it instead of a sugar-sweetened beverage, reducing beverage calories. |
There is no cited direct head-to-head trial establishing that one option causes greater weight loss. The evidence on diet drinks is chiefly about replacing sugar-sweetened drinks, not adding a drink to an unchanged diet.
What the evidence says about diet soda
Replacing sugary soda can reduce beverage calories
A 12-ounce regular soda has about 42 grams of added sugar and 150 calories, according to CDC. Replacing it with a low- or no-calorie drink can reduce calories from beverages, although that alone does not guarantee weight loss. CDC
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- FRESH FIZZ ON DEMAND: This SodaStream TERRA CO2 bundle is perfect for Seltzer lovers; It contains 3 ready-to-use CO2 cylinders that together make 180 liters (48 gallons) of fresh sparkling water in seconds, right on your countertop.
- A SECURE SNAP AND SEAL: The Quick Connect CO2 cylinder clicks in with one push, and the bottle snaps into place before you fizz. The seal is built to keep the bubbles in the bottle and the water off your counter, so even your first drink feels easy.
- THE QUICK CONNECT CO2 SYSTEM: Each 60L Quick Connect cylinder makes up to 60 liters (16 gallons) of sparkling water. When it runs low, return, refill, and reuse it through SodaStream CO2 cylinder exchange at participating retailers. The Quick Connect fit makes every swap simple, so you are back to fizzing fast.
- BUILT FOR DAILY USE: The reusable bottles are BPA free and dishwasher safe, ready for the next round whenever you are. The slim machine sits neatly on the counter and tucks under most upper cabinets, built to keep up with you day after day.
- ONE MACHINE, EVERY KIND OF DRINK: After fizzing your water, add flavor drops for zero sugar sparkling water, stir in Pepsi or Mountain Dew syrups for a classic soda, or add a squeeze of citrus for a fresh twist. One soda maker, every kind of drink, made by you.
The American Diabetes Association’s Standards of Care in Diabetes—2025 similarly describes small improvements in weight and cardiometabolic risk factors when low- or no-calorie sweetened drinks replace sugar-sweetened drinks, in a direction similar to water. The ADA also notes that these sweeteners do not aid weight loss without energy restriction, and that eating more calories elsewhere can blunt the reduction. This guidance is written in the context of diabetes care. ADA
Long-term effects and recommendations are not settled
WHO’s 2022 systematic review found no clear consensus on long-term weight loss or maintenance from non-sugar sweeteners. In its 2023 guideline, WHO recommended against using them as a strategy for weight control or reducing noncommunicable-disease risk, citing a lack of long-term body-fat benefit. WHO expressly framed this as a weight-control recommendation, not a toxicological safety assessment of individual sweeteners. WHO systematic review; WHO guideline
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These findings address different questions and evidence windows: short- to moderate-term replacement of sugary drinks versus using sweeteners as a long-term weight-control strategy. They do not show that diet soda independently causes weight loss, nor that approved diet drinks are unsafe.
Observational associations do not prove cause
Associations between diet drinks and weight gain can be difficult to interpret. As the ADA notes, reverse causality and residual confounding may contribute: people concerned about their weight may choose diet drinks, so an association does not by itself show that the drinks caused weight gain. ADA
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- Multi award winning design - Mysoda Ruby 2 silent water carbonator is the proud winner of The Chicago Athenaeum Green Good Design 2023, The Red Dot Award 2023 and has received the Design from Finland mark. Level up your kitchen decor with a Nordic design soda maker.
- Improved anti freeze nozzle creates a larger amount of smaller bubbles for smoother carbonation, while the scratch proof coating allows easier maintenance and a clean, premium finish. The Ruby 2 carbonation machine works perfectly as a home soda fountain machine and seltzer water maker, and is available in stunning tone to tone color schemes so you can choose the one that fits your kitchen best.
- Package includes 1x Ruby 2 sparkling water machine and 1L water bottle. Cylinder is sold separately. It uses the most common carbon cylinder for soda water makers with screw-in system, so that you can exchange your empty cylinder at your nearest store.
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What sparkling water can—and cannot—do
Plain sparkling water provides fizz without the sugar and calories of regular soda. CDC lists sparkling water, seltzer and flavored waters among low-calorie choices and recommends water, including sparkling water, as a substitute for sugary drinks. That category-level advice does not apply automatically to sweetened or caloric products: check the nutrition facts and ingredients. CDC; CDC
Choosing sparkling water may make a calorie-reducing swap easier if you prefer an unsweetened drink. The cited evidence does not show that sparkling water itself produces more weight loss than diet soda.
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- FRESH FIZZ ON DEMAND: The SodaStream TERRA turns plain tap water into fresh sparkling water in seconds, right on your countertop. One slow press gives a light fizz, a few more build a stronger bubble. This carbonated water machine puts every glass exactly where you like it, made by you, every time.
- A SECURE SNAP AND SEAL: The Quick Connect CO2 cylinder clicks in with one push, and the bottle snaps into place before you fizz. The seal is built to keep the bubbles in the bottle and the water off your counter, so even your first drink feels easy.
- THE QUICK CONNECT CO2 SYSTEM: Each 60L Quick Connect cylinder makes up to 60 liters (16 gallons) of sparkling water. When it runs low, return, refill, and reuse it through SodaStream CO2 cylinder exchange at participating retailers. The Quick Connect fit makes every swap simple, so you are back to fizzing fast.
- BUILT FOR DAILY USE: The reusable bottles are BPA free and dishwasher safe, ready for the next round whenever you are. The slim machine sits neatly on the counter and tucks under most upper cabinets, built to keep up with you day after day.
- ONE MACHINE, EVERY KIND OF DRINK: After fizzing your water, add flavor drops for zero sugar sparkling water, stir in Pepsi or Mountain Dew syrups for a classic soda, or add a squeeze of citrus for a fresh twist. One soda maker, every kind of drink, made by you.
Choose based on what you drink now
If you currently drink regular soda
Replacing some or all of it with either diet soda or plain sparkling water can lower beverage calories, provided you do not make up the difference elsewhere. Choose the option you can stick with: diet soda if sweetness helps you leave sugary soda behind, or plain sparkling water if you like unsweetened fizz.
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Switching to sparkling water is a reasonable preference, especially if you want to avoid non-sugar sweeteners. The available evidence does not show that making this switch will itself improve weight loss. Consider the overall eating pattern and whether your drink choice affects your calorie intake.
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- FRESH FIZZ ON DEMAND: The SodaStream TERRA turns plain tap water into fresh sparkling water in seconds, right on your countertop. One slow press gives a light fizz, a few more build a stronger bubble. This carbonated water machine puts every glass exactly where you like it, made by you, every time.
- A SECURE SNAP AND SEAL: The Quick Connect CO2 cylinder clicks in with one push, and the bottle snaps into place before you fizz. The seal is built to keep the bubbles in the bottle and the water off your counter, so even your first drink feels easy.
- THE QUICK CONNECT CO2 SYSTEM: Each 60L Quick Connect cylinder makes up to 60 liters (16 gallons) of sparkling water. When it runs low, return, refill, and reuse it through SodaStream CO2 cylinder exchange at participating retailers. The Quick Connect fit makes every swap simple, so you are back to fizzing fast.
- BUILT FOR DAILY USE: The reusable bottles are BPA free and dishwasher safe, ready for the next round whenever you are. The slim machine sits neatly on the counter and tucks under most upper cabinets, built to keep up with you day after day.
- ONE MACHINE, EVERY KIND OF DRINK: After fizzing your water, add flavor drops for zero sugar sparkling water, stir in Pepsi or Mountain Dew syrups for a classic soda, or add a squeeze of citrus for a fresh twist. One soda maker, every kind of drink, made by you.
If you are comparing packaged products
- Check calories and serving size rather than relying on words such as “sparkling,” “diet” or “flavored.”
- Review the ingredient list for added sugars and non-sugar sweeteners; formulations differ by product.
- Ask whether the drink replaces a sugary beverage or is being added alongside your usual intake.
- Notice whether the swap leads you to eat more elsewhere, which can reduce the calorie difference.
How large is the sugary-drink baseline?
CDC reports that about 42 grams of added sugar and 150 calories are in a 12-ounce regular soda. Separate CDC figures say 49% of US adults drank a sugar-sweetened beverage on a given day and adults averaged 145 calories from these beverages on a given day; those figures reflect 2011–2014 data, not current consumption. CDC; CDC
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