/ / Stewart's Diet Root Beer

Stewart's Diet Root Beer

Contains aspartame

This root beer is zero-calorie, sugar-free and caffeine-free. It contains aspartame, natural and artificial flavors, caramel color and potassium benzoate.

Seed-oil freeNo added sugarNo added nitritesNo phosphatesNo gums or thickenersNo gluten ingredientsDairy-freeVegetarian
$34.99 12 Pack · lowest price at SONO Group
Price and stock checked Nov 1, 2026
Key nutrition facts
0caloriesPer serving · 1 Bottle
Protein
0g
Fiber
—
Added sugar
—
Sodium
45mg
Saturated fat
—
From the product label
Ingredients: Carbonated Water, Natural and Artificial Flavors, Caramel Color, Aspartame, Potassium Benzoate, Citric Acid, Quillaia Extract, Acacia, Yucca Extracts
Product details
PackagingGlass bottlesGlass
“12 Pack / 12 Oz Glass Bottles” — the product page
63 / 100
Fair Scored automatically
Weighted as beveragesMedium confidence · Scored on 7 of 11 inputs
Nutrition · counts 35%75
Ingredients · counts 30%64
Processing · counts 10%25
Sourcing · counts 10%50
Transparency · counts 15%65
Why it scores 63
Nutrition 75 · Typical for drinks; no added sugar per 1 Bottle
Ingredients 64 · Aspartame (artificial sweetener, −12); Benzoates (sodium benzoate, benzoic acid) (additive, −10); Artificial flavours (additive, −10); 1 more
Processing 25 · Diet soda with aspartame, flavors, caramel color and a preservative
Sourcing 50 · No ingredient origin or production practices are stated
Transparency 65 · Complete ingredient list, but no specific sourcing claims
Aspartame
Artificial flavors
Caramel color
Potassium benzoate
Evidence behind the Ingredients deductions
Varies by additive−24 for benzoates, artificial flavours, caramel colour
Mixed evidence−12 for aspartame
Scored Oct 20, 2026 · Scoring guide v3.1 · Updated Oct 20, 2026 · See what changed

Your diet score

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Diet profiles v1.1. Defaults come from published guidance; you can change any limit. How the diet score works

Ingredients
Carbonated Water Natural and Artificial Flavors Caramel Color Aspartame Potassium Benzoate Citric Acid Quillaia Extract Acacia Yucca Extracts
9 ingredients 3 to avoid
Sourcing

Origin not disclosed on the product page.

Additives5 additives · 3 moderate risk
Benzoates (sodium benzoate, benzoic acid) (E210–E212)PreservativeModerate risk
Can form small amounts of benzene with vitamin C in drinks, and was part of the 2007 UK hyperactivity study mix.
Aspartame (E951)SweetenerModerate risk
IARC classified it as possibly carcinogenic (Group 2B) in 2023, while JECFA kept its acceptable daily intake.
Artificial flavoursFlavouringModerate risk
Undisclosed synthetic compounds; the FDA delisted seven synthetic flavours in 2018 after cancer findings in animals.
Caramel colour (E150)ColourLimited risk
Some types (E150c, E150d) can contain 4-MEI, which IARC lists as possibly carcinogenic (Group 2B); levels are regulated.
Citric acid (E330)AcidNo risk
Usually made by fermentation; considered safe.
Matched from the ingredient list. Risk levels summarise findings from EFSA, the FDA, IARC and published studies; they explain a concern, not a diagnosis.

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