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Three consumers have filed a proposed class-action lawsuit accusing Starbucks of misleadingly labeling eight protein lattes and matchas “Sugar-Free.” The complaint says large servings contain 13 to 21 grams of naturally occurring milk sugar; Starbucks disputes the claims and says it will defend itself.
Three consumers have filed a proposed class-action lawsuit accusing Starbucks of misleading customers by calling eight protein lattes and matchas “Sugar-Free” when large, venti servings contain 13 to 21 grams of sugar, according to the complaint. Starbucks says the claims have no merit and that it intends to defend itself.
The complaint was filed Oct. 2 in the U.S. District Court for the Western District of Washington in Seattle. It names Starbucks as the sole defendant and was brought by Michael Walsh of California, Anne Legnini of New York and Elna Potter of Washington. The plaintiffs seek a jury trial and propose to represent a class of consumers; the court has not determined whether the case may proceed as a class action.
The challenged products are the hot and iced versions of Starbucks’ Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha and Sugar-Free Caramel Protein Matcha. The complaint identifies a venti Caramel Protein Matcha as having the most sugar, at 21 grams. It says the drinks contain milk, and argues that its naturally occurring lactose counts as sugar even if no table sugar or sweetened syrup is added.
The plaintiffs allege the labeling violates federal food-labeling rules because the drinks contain more than 0.5 grams of sugar, the threshold they cite for a “sugar-free” claim. They also allege Starbucks omitted a required calorie-related disclaimer. These are allegations, not findings by a court. The complaint distinguishes “sugar-free” from “no added sugar,” arguing consumers could reasonably understand the former to mean the beverage contains virtually no sugar.
How Milk Sugar Shapes the Claim
The dispute turns on the difference between total sugar and added sugar. Milk naturally contains lactose, so a drink can have no sweetened syrup added and still contain sugar. The lawsuit argues that the words “Sugar-Free” communicate a broader promise than “no added sugar,” particularly to customers monitoring their total sugar intake.
For Starbucks, the case puts product naming and nutrition disclosures under scrutiny across a new beverage line. For customers, the lawsuit highlights why the drink’s full nutrition information may matter alongside a menu name, especially when milk is an ingredient. The allegations have not been tested in court, and the filing alone does not establish that the labeling is unlawful or that customers were misled.
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Starbucks’ Protein Lineup
Starbucks launched its protein beverage lineup in September 2025, saying the drinks were designed to address consumer interest in protein. At launch, the company said protein lattes could provide up to 36 grams of protein per grande, while protein cold foam added about 15 grams. Those figures describe protein, not the sugar levels at issue in this lawsuit.
Starbucks’ protein beverage page currently describes the lineup as including “no-added-sugar options made with sugar-free syrups,” according to the report by Daily Coffee News. That wording is distinct from the product names challenged in the case. The complaint says federal rules count lactose in definitions of total sugars and argues the labeling should be judged accordingly.
The lawsuit comes amid other consumer challenges to food and coffee marketing claims, but those cases have had different outcomes and concern different products. Recent lawsuits over Trader Joe’s “low acid” coffee labeling were dismissed with prejudice, while another Starbucks case concerning sourcing claims and alleged compounds in decaffeinated coffee remained active, with Starbucks seeking dismissal, according to Daily Coffee News.
““No reasonable consumer would understand a beverage named ‘Sugar-Free’ to contain 13 to 21 grams of sugar per serving.””
— The complaint
Questions the Court Must Resolve
The court has not ruled on whether the drinks’ names violate federal labeling rules, whether the alleged disclaimer was required or whether the plaintiffs’ claims can be brought on behalf of a wider group of customers. The complaint’s descriptions of sugar levels and consumer expectations remain plaintiffs’ claims unless established through evidence or accepted by the court.
The materials available do not provide Starbucks’ detailed legal response or explain whether the company will change any product names or disclosures while the case is pending. It is also not clear what damages or other relief the plaintiffs will ultimately seek beyond the jury trial requested in the complaint.
The Case Moves Through Federal Court
The lawsuit will proceed in federal court, where Starbucks can respond to the complaint and the parties may contest the legal and factual basis of the claims. Any decision about whether the case qualifies as a class action would be a separate step from deciding whether the challenged labeling violated the rules cited by the plaintiffs.
Until the court issues rulings or the parties reach another resolution, the central dispute remains whether consumers could be misled by the “Sugar-Free” names when the drinks contain naturally occurring milk sugar. Starbucks has said it will defend the case; no outcome or schedule for a ruling was reported.
Key Questions
What does the lawsuit say Starbucks got wrong?
The plaintiffs allege Starbucks misleadingly labels eight protein drinks “Sugar-Free” even though venti servings contain 13 to 21 grams of sugar, largely from lactose in milk, according to the complaint.
Which drinks are named in the complaint?
The case covers 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.
Has a court found Starbucks violated labeling rules?
No. The case contains allegations that have not been decided. The filing does not establish that Starbucks broke the law or that the proposed class will be certified.
What has Starbucks said?
A company spokesperson told Daily Coffee News that Starbucks believes the claims have “no merit” and intends to defend itself. The company also said it provides information about ingredients, customization and nutrition across its channels.
Why can a drink with no added sugar still contain sugar?
Milk naturally contains lactose, a type of sugar. The complaint argues that this sugar counts toward total sugar under the federal rules it cites, even if no table sugar or sweetened syrup is added.
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