No soda is truly healthy, but some options are dramatically better than others. A standard 12-ounce can of regular cola contains about 39 grams of added sugar, which already exceeds the American Heart Association’s recommended daily limit of 25 grams for women and comes close to the 36-gram cap for men. The “healthiest” soda is one that keeps sugar near zero, skips questionable additives, and ideally offers something your body can use, like prebiotic fiber.
What Makes One Soda Better Than Another
The biggest factor is sugar content. UCSF Medical Center’s nutrition department rates beverages on a stoplight system: drinks with 0 to 5 grams of sugar per 12 ounces get a green light, 6 to 12 grams land in the yellow “drink occasionally” zone, and anything with high fructose corn syrup or above 120 calories per 8 ounces falls into the red. By that standard, most mainstream sodas are firmly in the red. A single can wipes out your entire sugar budget for the day and delivers zero nutritional value in return.
Beyond sugar, the ingredient list matters. Artificial colors, phosphoric acid, and high fructose corn syrup are the hallmarks of conventional soda. Simpler ingredient lists with recognizable components, natural sweeteners, and added fiber put a drink in a different category entirely.
Prebiotic Sodas: Olipop vs. Poppi
The two brands that dominate the “healthy soda” space are Olipop and Poppi, and they’re not interchangeable. Olipop packs 9 grams of dietary fiber per can, sourced from cassava root fiber, chicory root inulin, Jerusalem artichoke inulin, and kudzu root extract. That’s roughly a third of the fiber most adults need in a day, delivered in a format that tastes like soda. Most flavors contain 2 to 5 grams of sugar.
Poppi contains just 2 grams of dietary fiber per can, all from agave inulin. It’s lighter, often a bit sweeter-tasting, and still far better than a regular soda. But if you’re choosing between the two based on nutritional value alone, Olipop delivers significantly more fiber per serving. Poppi works as a casual swap for diet soda; Olipop functions more like a functional beverage that happens to be carbonated.
One caveat: if you’re not used to eating much fiber, jumping straight to a 9-gram prebiotic soda can cause bloating or gas. Starting with a half can and building up over a few days gives your gut time to adjust.
What About Probiotic Sodas
Some newer brands market themselves as probiotic sodas, claiming to deliver live bacteria that support gut health. The problem is that these drinks typically add bacteria to a carbonated liquid rather than creating them through fermentation. Mayo Clinic Press notes that it’s unclear how many of these added bacteria survive the acidic environment of your stomach. A serving may not contain enough live organisms to deliver a measurable benefit. If gut health is your goal, fermented drinks like kefir or kombucha have a stronger track record than sodas with probiotics sprinkled in.
Natural Sweeteners and Blood Sugar
Many healthier sodas replace sugar with stevia, monk fruit, or allulose. All three have minimal impact on blood sugar levels, which makes them useful for people managing diabetes or simply trying to reduce sugar intake. Stevia and monk fruit are calorie-free. Allulose contains a small number of calories but largely passes through the body unmetabolized, and some research suggests it may actually improve blood glucose levels in people without diabetes.
These sweeteners aren’t perfect flavor matches for sugar. Stevia can have a slightly bitter aftertaste at higher concentrations, while monk fruit tends to taste cleaner. Many brands blend two or more of these sweeteners together to get closer to the sugar-like taste people expect from soda.
A Note on Erythritol
Erythritol is another zero-calorie sweetener found in some low-sugar sodas and sparkling waters. A 2024 study published in an American Heart Association journal found that consuming 30 grams of erythritol enhanced platelet reactivity in healthy volunteers, meaning blood cells involved in clotting became more active. This raises concerns about increased clotting risk, though 30 grams is a large dose, well above what you’d find in a single drink. Still, if you have a history of cardiovascular issues or blood clots, it’s worth checking labels for this ingredient.
Diet Soda: Better Than Regular, but Not Great
Zero-sugar versions of mainstream sodas eliminate the sugar problem entirely, and that’s a meaningful improvement. But they introduce other considerations. Most rely on aspartame or sucralose for sweetness. In 2023, the World Health Organization’s cancer research agency classified aspartame as “possibly carcinogenic to humans,” a category that reflects limited evidence rather than a strong conclusion. At the same time, the WHO’s food safety committee found no reason to change the acceptable daily intake that’s been in place for decades. For most people, a diet soda here and there poses minimal risk. But it’s still essentially carbonated water, sweetener, acid, and artificial color, with nothing beneficial added.
Phosphoric acid, found in most colas, is another ingredient worth noting. It contributes to the sharp, tangy taste but also lowers the pH of the drink significantly, which is harder on tooth enamel than a naturally flavored sparkling water.
Plain Sparkling Water Is the Simplest Option
If you’re after the fizz more than the flavor, plain sparkling water is the cleanest choice. Research cited by the American Dental Association found that unflavored sparkling water affects tooth enamel about the same as regular still water. The carbonation alone isn’t the problem. Citrus-flavored sparkling waters, however, have higher acid levels that do increase enamel erosion risk over time, so plain or non-citrus varieties are gentler on your teeth.
Brands like Topo Chico, San Pellegrino, or store-brand seltzer give you carbonation with literally nothing else. Adding a squeeze of fresh fruit or a splash of juice at home lets you control exactly how much sugar goes in, usually far less than any pre-made soda.
Ranking Your Options
- Best overall: Plain sparkling water, with or without a splash of real fruit. Zero sugar, no additives, and no enamel risk beyond regular water.
- Best soda-like experience: Olipop, for its low sugar content (2 to 5 grams), 9 grams of prebiotic fiber, and short ingredient list built around plant-based fibers and natural sweeteners.
- Solid middle ground: Poppi or other prebiotic sodas with under 5 grams of sugar. Less fiber than Olipop but still a major upgrade from conventional soda.
- Acceptable swap: Zero-sugar sparkling waters sweetened with stevia or monk fruit, like Zevia. No sugar, no artificial colors, but no added nutritional benefit either.
- Last resort: Diet versions of mainstream sodas. They eliminate sugar but keep artificial colors, phosphoric acid, and sweeteners with mixed long-term data.
The healthiest soda is ultimately the one that replaces something worse. Swapping a daily regular cola for an Olipop or even a diet soda cuts 35 to 40 grams of added sugar from your day. That single change, sustained over months, is more impactful than obsessing over which zero-calorie sweetener is marginally better than another.