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Pepsi Diet Pepsi
Photo: Open Food Facts contributors (CC BY-SA)

Diet cola soft drink

Pepsi Diet Pepsi

12 oz

Okay out of 100 Medium confidence
  • Ultra-processed
  • Contains caffeine
  • No synthetic dyes
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Why it scores 48

Pepsi Diet Pepsi scores 48 out of 100 (Okay) 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. Ultra-processed (NOVA 4): Classified NOVA 4: made with industrial ingredients and additives. Strong
  3. Potassium benzoate: Benzoates can form small amounts of benzene in drinks that also contain ascorbic acid (vitamin C), especially with heat or light. 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

Diet Pepsi

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]
  • Potassium benzoate
    Strong Benzoates can form small amounts of benzene in drinks that also contain ascorbic acid (vitamin C), especially with heat or light. [5]
  • Phosphoric acid
    Strong EFSA (2019) set a group ADI for phosphates of 40 mg/kg body weight (as phosphorus) and noted that infants, toddlers and children may exceed it. [6]
  • Caffeine
    Strong The FDA cites 400 mg a day as generally safe for most adults; EFSA advises no more than 200 mg a day in pregnancy. [7][8]
  • Natural flavors
    Info "Natural flavor" is a legal category (21 CFR 101.22(a)(3)): flavor substances from spices, fruits, vegetables, meat, dairy or fermentation. [9][10]
subtotal−33

Processing

  • Ultra-processed (NOVA 4)
    Strong Classified NOVA 4: made with industrial ingredients and additives. [10]
  • 2 kinds of ultra-processing markers
    Emerging Industrial additive classes found: color (added) and flavoring. [10]
subtotal−19.5
TOTAL 48Okay

100 − 52.5 = 47.5 → 48

Can’t score above 79. Contains caramel color, an ingredient of high concern. [1][2][3][4]

GTIN 00012000008054 · 2026-03-03

score v1.3.0 · kb 2026.10.11

Medium confidence

Same product, same score. Every time.

Nutrition per 100 ml

Energy0 kcal
Fat0 g
Saturated fat0 g
Trans fat0 g
Carbohydrates0 g
Sugars0 g
Added sugars0 g
Fiber0 g
Protein0 g
Salt0 g

Serving: 1 can (12 fl oz)

Ingredients

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

CARBONATED WATER, CARAMEL COLOR, ASPARTAME PHOSPHORIC ACID, POTASSIUM BENZOATE (PRESERVES FRESHNESS), CAFFEINE, CITRIC ACID, NATURAL FLAVOR ACESULFAME POTASSIUM. PHENYLKETONURICS: CONTAINS PHENYLALANINE BOTTLED UNDER THE AUTHORITY OF PEPSICO, INC., 00277-101-00-16 PURCHASE, NY 10577. LUORIES CAFFEINE CONTENT: 35mg/12 fl oz. www.PEPSLCOM

Healthiest diet cola soft drink in the US

More from Pepsi

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. 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

  6. EFSA issues new advice on phosphates

    European Food Safety Authority · Jun 12, 2019 · Agency assessment

    “We estimated that dietary exposure to phosphates may exceed the new ADI for infants, toddlers and children with average consumption of phosphates in their diet.”

    efsa.europa.eu

  7. 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

  8. Caffeine (EFSA topic page; Scientific Opinion on the safety of caffeine, 2015)

    European Food Safety Authority · May 27, 2015 · Agency assessment

    “Caffeine intakes from all sources up to 200mg per day consumed throughout the day do not raise safety concerns for the foetus.”

    efsa.europa.eu

  9. 21 CFR 101.22 Foods; labeling of spices, flavorings, colorings and chemical preservatives

    Electronic Code of Federal Regulations (eCFR), U.S. Office of the Federal Register · Dec 19, 2016 · Law

    “whose significant function in food is flavoring rather than nutritional.”

    ecfr.gov

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

    Public Health Nutrition · April 2019 · Peer-reviewed

    doi.org

  11. 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

  12. 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

  13. 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