No soda is genuinely good for you, but some options are far less harmful than others. Regular soda is one of the most concentrated sources of added sugar in the modern diet, and diet sodas come with their own set of concerns. The best approach is understanding what makes most sodas harmful and which alternatives come closest to being a reasonable choice.
Why Regular Soda Is So Harmful
A single 12-ounce can of regular soda contains about 39 grams of added sugar. The American Heart Association recommends no more than 36 grams of added sugar per day for men and 25 grams for women. One can puts men at their daily limit and women well past it, before accounting for anything else they eat that day.
Most of that sugar comes from high-fructose corn syrup, which the body metabolizes in ways that are particularly damaging over time. Fructose drives fat accumulation in the liver through increased fat production and impaired fat burning. This process is a direct contributor to non-alcoholic fatty liver disease, a condition whose rising prevalence tracks closely with the increase in sugar consumption. Fructose is also the only natural sugar that raises uric acid levels, which is linked to gout and kidney problems.
Beyond the liver, regular fructose consumption promotes insulin resistance, elevated blood triglycerides, and weight gain. These aren’t theoretical risks from extreme consumption. They’re metabolic shifts that build gradually with the kind of daily soda habit millions of people maintain.
Dark colas carry an additional concern. The phosphoric acid used for their sharp flavor interferes with calcium balance in the body. Research published in Mayo Clinic Proceedings found that drinking roughly half a can or more of cola per day is a risk factor for low calcium levels in children. In postmenopausal women, the threshold was about one can per day. Animal studies confirmed this link, showing lower bone mineral density in subjects consuming cola compared to water.
Diet Soda: Better but Complicated
Switching to diet soda eliminates the sugar problem entirely, which is a meaningful improvement. But the sweeteners used in diet sodas have their own evolving risk profile.
Aspartame, the most common artificial sweetener in diet sodas, was classified by the International Agency for Research on Cancer as “possibly carcinogenic to humans” (Group 2B) based on limited evidence linking it to liver cancer. That sounds alarming, but context matters. Group 2B is a low-confidence classification, and the WHO’s food safety committee reviewed the same evidence and found no reason to change its longstanding safe intake limit of 40 milligrams per kilogram of body weight per day. For a 150-pound person, that works out to roughly 12 to 14 cans of diet soda daily, a level almost nobody reaches.
The practical concern with diet soda isn’t cancer. It’s the less dramatic but more plausible effects on appetite, gut bacteria, and metabolic signaling that researchers are still working to pin down. If you’re choosing between a regular Coke and a Diet Coke, the diet version is the less damaging option. But “less damaging” isn’t the same as “good for you.”
Prebiotic Sodas: Marketing vs. Reality
Brands like Olipop and Poppi have positioned themselves as sodas that are actually healthy, largely because they contain inulin, a plant-based fiber sourced from chicory root or agave. Inulin does have real benefits. One study found that inulin-rich foods boosted populations of beneficial gut bacteria, helped people feel full longer, and reduced cravings for unhealthy foods. Other research has shown inulin supplements can reduce insulin resistance in people with Type 2 diabetes.
The issue is dose. A can of prebiotic soda typically contains 2 to 9 grams of fiber, depending on the brand. That’s a modest contribution to the 25 to 38 grams of daily fiber most adults need, and it’s far less than the amounts used in clinical studies showing clear benefits. You’d get more fiber from an apple or a handful of almonds.
There’s also a ceiling to consider. High levels of inulin, around 30 grams per day, have been associated with inflammation and liver damage in research. You’re unlikely to reach that from prebiotic soda alone, but it’s worth noting if you’re also taking fiber supplements or eating a lot of inulin-rich foods. Most prebiotic sodas also contain some sugar or sweeteners, so they’re not a free pass.
Watch for “Natural” Sweetener Risks
Many newer sodas use stevia, erythritol, or xylitol instead of sugar or artificial sweeteners, marketing themselves as a cleaner alternative. Stevia has a relatively clean safety record so far, but erythritol and xylitol have come under serious scrutiny.
Cleveland Clinic researchers found that consuming erythritol caused blood levels of the sweetener to spike over 1,000 times above baseline in healthy volunteers. More concerning, participants showed a significant increase in blood clot formation after consuming erythritol, with no such change after consuming regular glucose. A prior study from the same team found that cardiac patients with high erythritol levels were twice as likely to experience a heart attack, stroke, or other major cardiac event over the following three years compared to those with low levels.
Xylitol showed a similar pattern. High blood levels were associated with increased risk of heart attack, stroke, or death over three years, and it affected platelet activity the same way erythritol did. These findings don’t mean a single piece of sugar-free gum will harm you, but if you’re drinking multiple cans of an erythritol-sweetened or xylitol-sweetened soda daily, the cardiovascular signal is hard to ignore.
The Best Options, Ranked
If you want something carbonated that won’t work against your health, here’s how the options stack up:
- Plain sparkling water is the clear winner. The American Dental Association tested sparkling water against regular water and found the two were essentially identical in their effects on tooth enamel. Despite being slightly more acidic than still water, plain seltzer or club soda is just water to your teeth and carries none of the metabolic risks of sweetened drinks.
- Sparkling water with a splash of juice gives you flavor with a fraction of the sugar in soda. Aim for just enough to taste, not a 50/50 mix.
- Prebiotic sodas are a reasonable occasional choice, especially if they’re replacing regular soda in your routine. They offer modest fiber and far less sugar than traditional soda, but they’re not the gut health powerhouse their branding implies.
- Diet soda is a step up from regular soda if you can’t give up the taste. The risks of artificial sweeteners at normal intake levels are small compared to the well-documented harms of 40 grams of sugar per can.
One thing to watch with any flavored sparkling water: citrus-flavored varieties tend to have higher acid levels that increase the risk of enamel erosion. If you drink them regularly, using a straw and rinsing with plain water afterward helps protect your teeth.
What Matters Most
The honest answer to “what soda is good for you” is that no soda delivers a meaningful health benefit. The question worth asking instead is how to get the fizzy, flavored drink you enjoy with the fewest trade-offs. Plain sparkling water does that better than anything else on the market. If you need sweetness, a stevia-sweetened sparkling water is the current best bet, though no sweetener has a long enough track record to call risk-free. And if you’re currently drinking one or more regular sodas a day, switching to almost anything else on this list is one of the single most impactful dietary changes you can make.