Is Root Beer Bad for You? A Look at the Ingredients

Root beer sits in an odd spot among soft drinks. It carries a folksy, old-fashioned reputation that makes it seem more wholesome than a neon-colored soda, yet its ingredient list reads much like any other sweetened carbonated beverage. The biggest health concern with regular root beer is the same one that applies to all non-diet sodas: a large amount of added sugar. Beyond that, several ingredients specific to root beer, from caramel coloring to sodium benzoate to wintergreen-derived flavoring compounds, deserve a closer look. None of them are acutely dangerous at the levels found in a single can, but the picture changes when you drink root beer routinely.

Sugar Is the Main Problem

A typical 12-ounce can of root beer contains somewhere around 39 to 46 grams of sugar, depending on the brand. That is roughly ten teaspoons, nearly all of it from high-fructose corn syrup or cane sugar. One can puts you at or above the American Heart Association’s recommended daily cap of 36 grams for men and 25 grams for women. This alone is enough to make habitual root beer consumption a legitimate health concern.

The specific type of sugar matters, too. High-fructose corn syrup delivers a substantial fructose load that the liver must process, and research has linked regular soft drink consumption to fat accumulation in the liver through fructose-driven increases in fat production. A study in the World Journal of Gastroenterology found that routine soft drink intake was associated with nonalcoholic fatty liver disease, with fructose driving increased lipogenesis as the primary mechanism.¹ This is not a root beer-specific problem, but root beer is among the higher-sugar sodas on the shelf, so it is a front-line offender.

Weight gain, insulin resistance, and increased risk of type 2 diabetes are all well-documented consequences of regularly drinking sugar-sweetened beverages. If you are evaluating whether root beer is “bad for you,” this is the ingredient doing the most measurable damage in most people’s diets. Everything else on the label is secondary.

Caramel Color and 4-Methylimidazole

The deep brown color of most root beers comes from caramel coloring, not from actual caramelized sugar in any meaningful sense. Caramel color is manufactured industrially, and certain types of the process produce a byproduct called 4-methylimidazole, often shortened to 4-MEI. This compound has drawn regulatory attention because animal studies have linked high doses to cancer, and California’s Proposition 65 requires warning labels on beverages that expose consumers to more than 29 micrograms of 4-MEI per day.²

Researchers have measured widely varying 4-MEI concentrations across brands and even across geographic markets. The same study that mapped these exposures found that some soft drinks purchased outside California exceeded the Proposition 65 threshold, while reformulated versions sold within California had lower levels. Root beer brands that use caramel color are part of this landscape, though 4-MEI levels vary by manufacturer and production method.

A 2025 review in Toxicology Letters provided a broader look at 4-MEI’s toxicology, covering its formation during caramel coloring production and its potential pathways of harm.³ The regulatory picture is uneven: California treats it more cautiously than the FDA does nationally, and international agencies have reached different conclusions about the dose at which it becomes worrisome. For an occasional root beer drinker, 4-MEI exposure is probably trivial. For someone drinking multiple cans daily, it becomes one more low-level chemical exposure stacking on top of others. Some craft root beers skip caramel coloring entirely, which eliminates this concern altogether.

Sodium Benzoate as a Preservative

Most commercially bottled and canned root beers contain sodium benzoate, a preservative that prevents bacterial and fungal growth in acidic beverages. It is one of the most widely used food preservatives worldwide, and regulatory agencies generally regard it as safe at the concentrations found in soft drinks. But it has not escaped scrutiny.

An in vitro study published in Food and Chemical Toxicology tested sodium benzoate and potassium benzoate on cultured human blood cells at various concentrations. The researchers found that both compounds caused significant chromosomal damage, including increased chromosomal aberrations and micronuclei formation, compared to untreated controls. Sodium benzoate also increased DNA damage as measured by a comet assay.⁴

This sounds alarming, but context matters. These were cells in a lab dish exposed to concentrations much higher than what your cells experience after you drink a root beer. The body metabolizes sodium benzoate relatively quickly, converting it to hippuric acid and excreting it in urine. The gap between what happens to isolated cells and what happens inside a living person is enormous, and regulatory agencies have maintained that dietary exposure levels remain safe. That said, some researchers continue to call for updated safety reviews, and the lab findings are a reminder that “generally recognized as safe” does not mean “inert.” People who are sensitive to benzoate preservatives may notice headaches or other mild reactions.

A separate concern involves benzene formation. When sodium benzoate is combined with ascorbic acid (vitamin C) in an acidic environment, trace amounts of benzene can form. Most root beers do not contain added vitamin C, which makes this less of an issue than it is for citrus-flavored sodas. Still, if a root beer recipe includes both ingredients, the chemistry is worth knowing about.

Carbonation and Your Digestive System

Root beer is carbonated, and the carbon dioxide gas dissolved in it has its own effects on digestion. The most immediate one is belching, which most people experience and dismiss. The more medically relevant effect involves the lower esophageal sphincter, the muscular valve between your esophagus and stomach that keeps stomach acid from traveling upward.

A study published in the Journal of Gastrointestinal Surgery found that all carbonated beverages tested produced a sustained reduction of 30 to 50 percent in the strength of the lower esophageal sphincter, lasting about 20 minutes. In over 60 percent of cases, the weakening was severe enough to reach levels normally considered diagnostic of sphincter incompetence, a condition associated with gastroesophageal reflux disease.⁵ Tap water, by comparison, did not produce the same effect.

If you already deal with acid reflux or heartburn, root beer’s carbonation can make episodes worse. The researchers suggested this mechanism could be relevant to the high rates of reflux disease in Western populations where carbonated beverages are consumed daily. For someone without reflux issues, the occasional root beer is unlikely to cause problems. But if you are drinking it regularly and noticing a burning sensation creeping up your chest after meals, the carbonation is a plausible contributor.

Root Beer Is Usually Caffeine-Free, and That Matters

Unlike most colas and many other dark sodas, the vast majority of root beer brands contain no caffeine. This is one of root beer’s genuine advantages as a soft drink. Caffeine-sensitive individuals, pregnant people monitoring intake, and parents choosing beverages for young children face one fewer concern with root beer than with a typical cola.

Research on safe caffeine thresholds has suggested that healthy adults can consume up to around 400 milligrams per day without adverse effects, while children aged four to six should stay below about 45 milligrams per day.⁶ A single cola contains roughly 30 to 45 milligrams of caffeine, so even moderate soda consumption pushes children toward or past recommended limits. Root beer sidesteps this entirely for most brands.

There are exceptions. A handful of root beer products, especially those marketed as “energy” or boutique craft varieties, do contain caffeine. Always check the label if caffeine matters to you, but the default expectation for mainstream root beer is zero.

What About Diet Root Beer?

Switching to diet root beer eliminates the sugar problem, which is the single biggest health concern. But it introduces artificial sweeteners, typically aspartame, acesulfame potassium, or sucralose, depending on the brand. The safety of these sweeteners has been debated for decades, and the research picture is more nuanced than either their defenders or critics tend to acknowledge.

A 2025 review in the Journal of the Science of Food and Agriculture examined evidence from cell studies, animal models, and human trials, concluding that artificial sweeteners can alter the composition of gut bacteria. These shifts raised concerns about potential effects on gut health and susceptibility to gastrointestinal problems, as well as changes in the metabolites gut bacteria produce.⁷ A separate review published in Nutrients examined eight different non-nutritive sweeteners individually and reached a more cautious conclusion: current evidence does not support a blanket statement that artificial sweeteners are uniformly harmful or uniformly safe.⁸

The same liver study that linked regular soft drinks to fatty liver disease also noted that diet soft drinks were not entirely off the hook. The researchers pointed to aspartame and caramel colorant as sources of advanced glycation end products, compounds that could contribute to insulin resistance and inflammation through a different pathway than sugar.¹ This is a less well-established mechanism than fructose-driven fat accumulation, but it complicates the assumption that “diet” automatically means “fine for your metabolism.”

In practical terms, diet root beer is almost certainly a better choice than regular root beer if you are drinking soda frequently, simply because removing 40-plus grams of sugar per serving is a large metabolic win. But treating it as a health-neutral beverage would be getting ahead of the science. The sweetener research is evolving quickly, and the honest summary is that we do not yet know the long-term consequences of daily artificial sweetener consumption with confidence.

Flavoring Compounds Unique to Root Beer

Root beer’s distinctive taste comes from a blend of flavoring agents that varies by brand but typically includes wintergreen, vanilla, anise, and sassafras-derived compounds. Some of these have their own toxicological profiles worth understanding.

Wintergreen flavor comes from methyl salicylate, a compound chemically related to aspirin. In concentrated form, methyl salicylate is genuinely dangerous; swallowing a small bottle of wintergreen oil can be lethal, especially in children. In root beer, the amounts are minuscule. A toxicological review in Critical Reviews in Toxicology derived an allowable daily intake for methyl salicylate of 11 milligrams per kilogram of body weight per day, based on reproductive effects observed in mice at much higher doses.⁹ For a 70-kilogram adult, that works out to 770 milligrams per day, a threshold you would not approach from root beer alone. But people who are sensitive to salicylates, including some individuals with aspirin allergies or certain chronic conditions, might want to be aware that root beer contains this compound.

The more historically interesting flavoring story involves sassafras. Traditional root beer was brewed with sassafras root bark, which contains safrole, a compound the FDA banned from food use in 1960 after animal studies showed it caused liver cancer in rodents. Modern root beer either uses sassafras extract from which safrole has been removed or relies entirely on synthetic flavoring. You will occasionally see claims online that root beer is dangerous because of safrole; those claims are decades out of date. The safrole is gone from commercial products.

Vanilla, anise, and various spice extracts round out the flavor profile and are not associated with health concerns at the trace levels used in beverages. If anything, some of these botanical compounds have antioxidant properties in isolation, though the amounts in root beer are far too small to deliver any meaningful health benefit. The “natural” aura surrounding root beer’s ingredient list is mostly marketing. The flavoring compounds are present in quantities that affect taste, not physiology.

Does the Can Itself Matter?

Most root beer is consumed from aluminum cans or plastic-lined bottles, and the packaging introduces its own set of chemical considerations. Aluminum cans are lined with an epoxy coating to prevent the acidic beverage from corroding the metal, and those linings have historically contained bisphenol A (BPA), an endocrine-disrupting chemical linked to reproductive and metabolic problems.

A recent study evaluating BPA and its analogs (BPS and BPF) in canned beverages found that migration levels increased with both temperature and storage time. BPA concentrations averaged about 0.58 micrograms per liter across the beverages tested, with the highest reading, 2.2 micrograms per liter, found in cola stored at 40°C for 90 days. Storage duration had a strong positive correlation with migration levels, while higher temperatures had a moderate effect.¹⁰

The practical takeaway is straightforward: canned root beer stored in a cool environment and consumed within a reasonable time frame has low BPA exposure. Root beer that has been sitting in a hot garage or warehouse for months will have higher levels. Many manufacturers have moved to BPA-free can linings, but “BPA-free” does not mean “bisphenol-free,” as the replacement compounds BPS and BPF were also detected in the study, though at much lower concentrations. If minimizing endocrine disruptor exposure matters to you, glass-bottled root beer eliminates this variable entirely.

How Root Beer Compares Within the Soda Aisle

Root beer is neither the best nor the worst soft drink you could choose, and its relative ranking depends on what you are trying to avoid. Compared to caffeinated colas, root beer wins on the caffeine front. Compared to clear sodas like lemon-lime varieties, root beer carries more concern from caramel coloring and the associated 4-MEI exposure. Its sugar content is comparable to other mainstream sodas, landing squarely in the mid-to-upper range.

The perception that root beer is somehow more natural or healthier than other sodas is mostly a branding artifact. The word “root” and the historical association with sassafras bark create an herbal, old-timey image, but the product in a modern can is a highly processed, sugar-laden beverage with synthetic flavoring, industrial preservatives, and manufactured coloring. Craft and artisanal root beers sometimes use real cane sugar instead of high-fructose corn syrup and skip artificial colors, which addresses a couple of the ingredient-level concerns, but the sugar load remains.

One genuinely distinctive property of root beer is its lower acidity compared to most colas and citrus sodas. Root beer tends to have a pH closer to 4.0 to 4.5, while colas sit around 2.5 to 3.5. This means root beer is somewhat less erosive to tooth enamel than highly acidic alternatives, though it still contains plenty of sugar for oral bacteria to feed on. Less acid does not mean less cavity risk. The sugar is more than enough to sustain the bacterial processes that cause tooth decay.

Kids, Root Beer Floats, and Portion Size

Root beer has an outsized cultural presence in children’s diets, partly because it is caffeine-free and partly because of root beer floats, the classic combination of root beer and vanilla ice cream. A root beer float at a restaurant can easily contain 16 to 24 ounces of root beer plus a scoop or two of ice cream, pushing the total sugar content north of 80 grams in a single serving. That is a sugar bomb by any measure.

For kids, the absence of caffeine removes one concern, but the sugar remains a problem. Childhood consumption of sugar-sweetened beverages is linked to increased risk of obesity, dental caries, and early insulin resistance. The “treat” framing that surrounds root beer floats can obscure the magnitude of the sugar exposure. Occasional indulgence is one thing; weekly floats during summer represent a meaningful addition to a child’s sugar intake over time.

Portion creep is also worth noting. A standard can of root beer is 12 ounces, but convenience store fountain drinks routinely run 20 to 32 ounces, and some fast-food chains default to 16 ounces or more. Doubling the serving size doubles every ingredient concern discussed in this article. If you are going to drink root beer, the can is a better unit than the fountain cup simply because it has a fixed size.