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Three consumers have filed a proposed class-action lawsuit alleging that eight Starbucks protein lattes and matchas are misleadingly marketed as “Sugar-Free” because venti servings contain 13 to 21 grams of sugar from milk. Starbucks says the claims have no merit and that it will defend the case; no court ruling has been reported.
Three consumers have sued Starbucks, alleging that eight protein lattes and matchas marketed as “Sugar-Free” are misleading because large, or venti, servings contain 13 to 21 grams of sugar from milk. The proposed class action was filed Oct. 2 in the U.S. District Court for the Western District of Washington in Seattle; Starbucks denies the allegations and says it plans to defend itself.
The complaint names hot and iced versions of the Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha and Sugar-Free Caramel Protein Matcha. The plaintiffs are Michael Walsh of California, Anne Legnini of New York and Elna Potter of Washington. Starbucks is the sole defendant, and the plaintiffs seek a jury trial.
According to the complaint, the drinks’ sugar comes from lactose in milk; the plaintiffs do not allege that Starbucks added table sugar or sweetened syrups. The filing argues that calling a drink “Sugar-Free” is different from saying it has “no added sugar,” and says federal food-labeling rules do not permit a sugar-free claim when a product contains more than 0.5 grams of sugar. It also argues that regulations count lactose as a total sugar and alleges Starbucks omitted a required calorie-related disclaimer.
The complaint identifies a venti Sugar-Free Caramel Protein Matcha as the highest-sugar drink in its examples, at 21 grams. It compares that quantity with about five teaspoons of sugar and says it is nearly as much total sugar as a standard Kit Kat bar. Those comparisons and the plaintiffs’ interpretation of labeling rules are arguments in the complaint, not findings by a court.
How Milk Sugar Shapes the Claim
The case turns on what consumers are likely to understand by the phrase “Sugar-Free”, and how that phrase applies when sugar is naturally present in an ingredient rather than added as a sweetener. That distinction may matter to customers who rely on product names to manage sugar intake, as well as to companies deciding how to describe beverages made with milk.
The lawsuit also raises a practical menu question: a product described as having no added sugar can still contain naturally occurring sugars. Starbucks says it provides nutritional information and customization details through its announcements, menus, marketing materials, website and app. The court has not ruled on whether those disclosures resolve the plaintiffs’ claims or whether the product names violate labeling requirements.
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Starbucks’ Protein Lineup Launch
Starbucks introduced its protein beverage lineup in September 2025, describing the drinks as a response to consumer demand for protein. At launch, the company said its protein lattes could provide up to 36 grams of protein per grande, while protein cold foam added about 15 grams. The suit concerns the named protein lattes and matchas, not every item in the broader lineup.
Starbucks’ protein beverage page currently describes the lineup as offering “no-added-sugar options made with sugar-free syrups,” according to the report on the lawsuit. The filing follows other disputes over coffee marketing and labeling, but those cases have had different outcomes and involve separate claims. A proposed case over Starbucks’ ethical-sourcing and decaffeinated-coffee claims remains active in federal court, while two recent cases challenging Trader Joe’s “low acid” coffee labeling were dismissed with prejudice. Those proceedings do not determine the claims in this case.
““No reasonable consumer would understand a beverage named ‘Sugar-Free’ to contain 13 to 21 grams of sugar per serving.””
— The lawsuit’s complaint
What the Court Has Yet to Decide
The allegations have not been tested or decided in court. It is not yet clear how Starbucks will respond in its formal filings, whether the judge will allow the proposed class action to proceed, or how the court will interpret the relevant federal labeling rules as applied to these drinks. The complaint’s claim about a required calorie-related disclaimer is also an allegation, not a finding.
The available report does not state the proposed class definition, the amount of damages sought or a schedule for future hearings. It also does not establish whether all consumers understood the drink names in the way the plaintiffs describe or what disclosures appeared at the point of purchase for each order.
Next Steps in the Seattle Case
The case will proceed in the U.S. District Court for the Western District of Washington, where Starbucks is expected to defend against the claims. The next developments will include the company’s court response and any decisions on preliminary motions or whether the case can proceed on behalf of a proposed class. No hearing date or ruling is identified in the source report.
Until the court makes findings, the sugar amounts and product descriptions cited in the complaint should be understood as the basis of the plaintiffs’ challenge, while Starbucks’ denial remains the company’s position. The dispute does not, by itself, establish that the drinks’ labeling is unlawful.
Key Questions
Which Starbucks drinks are named in the lawsuit?
The complaint targets hot and iced versions of the Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha and Sugar-Free Caramel Protein Matcha.
Why do the plaintiffs say the drinks contain sugar?
The plaintiffs say the drinks contain milk, which has naturally occurring lactose. They do not allege that Starbucks added table sugar or sweetened syrups to the beverages.
How much sugar does the complaint cite?
The complaint cites 13 to 21 grams per venti serving, with the highest figure attributed to a Sugar-Free Caramel Protein Matcha. These are figures cited in the filing, not findings from a court ruling.
What has Starbucks said about the case?
Starbucks says it believes the claims have “no merit” and intends to defend itself. The company also says it provides product, customization and nutrition information across its menus and digital channels.
Has a court ruled on whether the labeling is unlawful?
No ruling is reported. The case is a proposed class action, and the plaintiffs’ claims remain allegations that the court has yet to decide.
Source: rss
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