SodaStream can be significantly healthier than store-bought soda, but how much healthier depends entirely on what you put in the water. Plain carbonated water from a SodaStream is essentially calorie-free and sugar-free. Adding SodaStream’s flavored syrups narrows the gap, though most still contain less sugar than a can of Coke or Pepsi.
Sugar and Calories: The Core Difference
A 12-ounce can of Coca-Cola contains 39 grams of sugar and 140 calories. Pepsi has about 41 grams. SodaStream’s regular flavored syrups, when mixed at the recommended ratio, land around 16 grams of sugar and 60 calories per 12-ounce serving. That’s roughly 60% less sugar than a standard cola.
There’s an important catch, though. The sugar content of a SodaStream drink shifts based on how much syrup you pour. At the recommended 30 milliliters of syrup per liter, you’re looking at about 25 grams of sugar for the whole bottle. But if you’re heavy-handed and pour 50 milliliters, you’ll hit 42 grams per liter, which puts you right back in regular soda territory. The health advantage only holds if you measure your syrup or deliberately use less.
SodaStream’s diet and zero-calorie lines skip sugar entirely. These are sweetened with combinations of sucralose, stevia leaf extract, and erythritol. If your primary goal is cutting sugar and calories, these options or plain sparkling water are where the real benefit lies.
What Carbonation Does to Your Teeth
Tooth enamel starts to weaken when the pH of a drink drops below 5.5, and active erosion happens in the range of 2.0 to 4.0. Regular colas are highly acidic. Coca-Cola Classic has a pH of about 2.37, and Pepsi sits at 2.39. Both fall squarely in the “extremely erosive” category.
Plain carbonated water is a different story. Club soda measures around 5.24, and mineral waters like Perrier come in at 5.25. These are well above the erosion threshold. Dissolving CO2 in water does create a mild carbonic acid, but it’s far too weak to damage enamel the way cola does. The real erosion risk in soda comes from added phosphoric acid and citric acid, not from the bubbles themselves.
Flavored sparkling waters sit somewhere in between. Flavored seltzers tested in a large study published in the Journal of the American Dental Association ranged from about 3.07 to 3.70, placing them in the “erosive” zone. SodaStream’s flavored syrups likely push the pH down into a similar range because of their citric acid content. So while plain SodaStream water is gentle on your teeth, flavored versions deserve more caution. Drinking them with meals rather than sipping throughout the day reduces the time your enamel spends in an acidic environment.
Hydration and Fullness
One common concern is that carbonated water might not hydrate as well as flat water. Research using the Beverage Hydration Index, which measures how much urine a drink produces compared to still water, found that sparkling water hydrates identically to flat water. The carbonation doesn’t change how your body absorbs or retains the fluid.
Some people find that sparkling water makes them feel fuller than still water, which can be a small advantage if you’re trying to drink fewer sugary beverages. That mild sense of fullness from the carbonation may help reduce snacking or the urge to reach for a second drink.
Bone Health Concerns
The idea that carbonated drinks weaken bones has circulated for years, but research points the finger at cola specifically, not carbonation in general. A study in the American Journal of Public Health examined carbonated beverage consumption and bone mineral density in older women. After adjusting for age, calcium intake, exercise, and other lifestyle factors, bone density was not associated with intake of any type of carbonated beverage. The researchers concluded that modest consumption of carbonated drinks does not appear to harm bone density.
The bone concerns around cola are tied to phosphoric acid, an ingredient in dark colas that may interfere with calcium absorption. Plain sparkling water contains no phosphoric acid, so this particular risk doesn’t apply.
Where SodaStream Clearly Wins
The biggest health advantage of a SodaStream isn’t any single nutrient comparison. It’s the control it gives you. With a can of soda, you get a fixed amount of sugar, acid, and artificial ingredients. With a SodaStream, you can:
- Drink plain sparkling water with zero sugar, zero calories, and a tooth-friendly pH above 5.0
- Add a small splash of syrup for flavor while keeping sugar well below what a can of soda delivers
- Use zero-calorie syrups sweetened with stevia or sucralose if you want sweetness without sugar
- Add fresh fruit or citrus instead of processed syrups for flavor with no added sweeteners at all
That flexibility is the real value. If you use a SodaStream to make plain or lightly flavored sparkling water, you’re drinking something that’s essentially as healthy as tap water with bubbles. If you’re loading it with the maximum amount of flavored syrup, you’ve created a drink that’s better than cola but still a sugary beverage.
The Realistic Bottom Line
For someone who currently drinks one or two cans of soda a day, switching to a SodaStream with half-strength syrup would cut sugar intake by roughly 50 to 100 grams daily. Over a week, that’s the equivalent of eliminating 1.5 to 3 cups of pure sugar from your diet. Switching to plain sparkling water eliminates it entirely.
The carbonation itself is not the health concern in soda. Sugar, phosphoric acid, and extremely low pH are. A SodaStream removes or reduces all three, depending on how you use it. The closer you stay to plain carbonated water, the larger the health gap between your glass and a can of Coke.