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Coca-Cola Zero Sugar Cans
Photo: Open Food Facts contributors (CC BY-SA)

Diet cola soft drink

Coca-Cola Zero Sugar Cans

35 × 12 fl oz

Poor out of 100 Medium confidence
  • Ultra-processed
  • Contains non-nutritive sweeteners
  • Contains caffeine
  • No synthetic dyes
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Why it scores 29

Coca-Cola Zero Sugar Cans scores 29 out of 100 (Poor) under GoodSwap’s published rules. What moved the score most:

  1. Caramel color: The FDA says classes III and IV, which can contain 4-MEI, are the most commonly used food color additives by volume. Regulatory
  2. Aspartame: Labels must warn people with phenylketonuria (PKU) because aspartame contains phenylalanine (US and EU). Regulatory
  3. Ultra-processed (NOVA 4): Classified NOVA 4: made with industrial ingredients and additives. Strong

Every line of the math is on The Receipt below, with its evidence tier and sources.

Better sodas

The same kind of product, at least 10 points higher, sold in the US. Never paid placements.

The Receipt

Coca-Cola Zero Sugar Cans

START100

Ingredients

  • Caramel color
    Regulatory The FDA says classes III and IV, which can contain 4-MEI, are the most commonly used food color additives by volume. [1][2][3][4]
  • Aspartame
    Regulatory Labels must warn people with phenylketonuria (PKU) because aspartame contains phenylalanine (US and EU). [5][6][7][8][9][10][11][12][13]
  • Potassium benzoate
    Strong Benzoates can form small amounts of benzene in drinks that also contain ascorbic acid (vitamin C), especially with heat or light. [14]
  • Acesulfame potassium (Ace-K)
    Strong In the NutriNet-Santé cohort, acesulfame-K intake was associated with higher cancer risk; cause and effect is not established. [11][15][12][13]
subtotal−50

Processing

  • Ultra-processed (NOVA 4)
    Strong Classified NOVA 4: made with industrial ingredients and additives. [16]
  • 3 kinds of ultra-processing markers
    Emerging Industrial additive classes found: color (added), flavoring and non-nutritive sweetener. [16]
subtotal−21
TOTAL 29Poor

100 − 71 = 29

Can’t score above 79. Contains caramel color, an ingredient of high concern. [1][2][3][4][5][6][7][8][9][10][11][12][13]

GTIN 00049000058499 · 2026-05-30

score v1.3.0 · kb 2026.10.11

Medium confidence

Same product, same score. Every time.

Nutrition per 100 ml

Energy0 kcal
Fat0 g
Carbohydrates0 g
Sugars0 g
Added sugars0 g
Protein0 g
Salt0 g

Serving: 355ml

Ingredients

High Moderate Not recognized Tap an ingredient for its evidence and rules.
Label text, as published

CARBONATED WATER, CARAMEL COLOR, PHOSPHORIC ACID, ASPARTAME, POTASSIUM BENZOATE, NATURAL FLAVORS, POTASSIUM CITRATE, ACESULFAME POTASSIUM, CAFFEINE, STEVIA EXTRACT

Allergens and diets

  • Palm-oil-free

Always check the package: recipes change.

Healthiest diet cola soft drink in the US

More from Coca-Cola

Sources

  1. Questions & Answers About 4-MEI

    U.S. Food and Drug Administration · Mar 27, 2020 · Regulator

    “Based on current science, the FDA has no reason to believe that there are any immediate or short-term health risks presented by 4-MEI at the levels expected in food.”

    fda.gov

  2. Agents Classified by the IARC Monographs, Volumes 1–142 (List of Classifications)

    International Agency for Research on Cancer (WHO) · IARC

    monographs.iarc.who.int

  3. Caramel Color in Soft Drinks and Exposure to 4-Methylimidazole: A Quantitative Risk Assessment

    PLOS ONE · Feb 18, 2015 · Peer-reviewed

    doi.org

  4. Proposition 65 List of Chemicals Known to the State to Cause Cancer or Reproductive Toxicity

    California Office of Environmental Health Hazard Assessment (OEHHA) · Jul 31, 2026 · Law

    “The date refers to the initial appearance of the chemical on the list.”

    oehha.ca.gov

  5. 21 CFR 172.804 Aspartame

    Electronic Code of Federal Regulations (eCFR), U.S. Office of the Federal Register · Mar 24, 2023 · Law

    “PHENYLKETONURICS: CONTAINS PHENYLALANINE”

    ecfr.gov

  6. Regulation (EU) No 1169/2011, Annex III point 2.3 (aspartame)

    European Union (Official Journal) · Oct 25, 2011 · Law

    “‘contains a source of phenylalanine’ shall appear on the label in cases where aspartame/aspartame-acesulfame salt is designated in the list of ingredients by its specific name.”

    eur-lex.europa.eu

  7. Aspartame hazard and risk assessment results released (IARC, WHO and FAO joint news release)

    World Health Organization · Jul 14, 2023 · Agency assessment

    “Citing “limited evidence” for carcinogenicity in humans, IARC classified aspartame as possibly carcinogenic to humans (IARC Group 2B) and JECFA reaffirmed the acceptable daily intake of 40 mg/kg body weight.”

    who.int

  8. Carcinogenicity of aspartame, methyleugenol, and isoeugenol (IARC Monographs Vol. 134 working group summary)

    The Lancet Oncology · August 2023 · IARC

    doi.org

  9. Aspartame and Other Sweeteners in Food

    U.S. Food and Drug Administration · Feb 27, 2025 · Regulator

    “The FDA disagrees with IARC’s conclusion that these studies support classifying aspartame as a possible carcinogen to humans.”

    fda.gov

  10. EFSA completes full risk assessment on aspartame and concludes it is safe at current levels of exposure

    European Food Safety Authority · Dec 10, 2013 · Agency assessment

    “Aspartame and its breakdown products are safe for human consumption at current levels of exposure”

    efsa.europa.eu

  11. Artificial sweeteners and cancer risk: Results from the NutriNet-Santé population-based cohort study

    PLOS Medicine · Mar 24, 2022 · Peer-reviewed

    “In this large cohort study, artificial sweeteners (especially aspartame and acesulfame-K), which are used in many food and beverage brands worldwide, were associated with increased cancer risk.”

    doi.org

  12. WHO advises not to use non-sugar sweeteners for weight control in newly released guideline

    World Health Organization · May 15, 2023 · Agency assessment

    “The recommendation is based on the findings of a systematic review of the available evidence which suggests that use of NSS does not confer any long-term benefit in reducing body fat in adults or children.”

    who.int

  13. Dietary Guidelines for Americans, 2025–2030

    U.S. Department of Health and Human Services and U.S. Department of Agriculture · January 2026 · Regulator

    “Limit foods and beverages that include artificial flavors, petroleum-based dyes, artificial preservatives, and low-calorie non-nutritive sweeteners.”

    cdn.realfood.gov

  14. Benzene production from decarboxylation of benzoic acid in the presence of ascorbic acid and a transition-metal catalyst

    Journal of Agricultural and Food Chemistry · May 1993 · Peer-reviewed

    doi.org

  15. Re-evaluation of acesulfame K (E 950) as food additive (plain language summary)

    European Food Safety Authority · Apr 30, 2025 · Agency assessment

    “The acceptable daily intake (ADI) considered safe for all population groups was set at 15 mg/kg body weight (bw) per day.”

    efsa.europa.eu

  16. Ultra-processed foods: what they are and how to identify them

    Public Health Nutrition · April 2019 · Peer-reviewed

    doi.org

  17. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses

    BMJ · Feb 28, 2024 · Peer-reviewed

    “Greater exposure to ultra-processed food was associated with a higher risk of adverse health outcomes, especially cardiometabolic, common mental disorder, and mortality outcomes.”

    doi.org

  18. Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake

    Cell Metabolism · July 2019 · Peer-reviewed

    doi.org

  19. Spilling the Beans: How Much Caffeine is Too Much?

    U.S. Food and Drug Administration · Regulator

    “For most adults, the FDA has cited 400 milligrams* a day — that's about two to three 12-fluid-ounce cups of coffee — as an amount not generally associated with negative effects.”

    fda.gov

  20. Regulation (EU) No 1169/2011, Annex III point 4.1 (beverages with high caffeine content)

    European Union (Official Journal) · Oct 25, 2011 · Law

    “‘High caffeine content. Not recommended for children or pregnant or breast-feeding women’”

    eur-lex.europa.eu