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Three consumers have filed a proposed class action alleging Starbucks improperly markets eight protein lattes and matchas as “Sugar-Free” despite the lactose in their milk. Starbucks says the claims have no merit and that it will defend itself; the allegations have not been resolved in court.
Three consumers have filed a proposed class-action lawsuit against Starbucks, alleging the company misleads customers by calling eight protein lattes and matchas “Sugar-Free” even though venti servings contain 13 to 21 grams of sugar, largely from milk. Filed Oct. 2 in the U.S. District Court for the Western District of Washington, the case challenges how the drinks are labeled; Starbucks says the claims have no merit and that it will defend itself.
The complaint 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 representing a broader class of consumers. The court has not ruled on the allegations, and the filing does not establish that Starbucks violated labeling rules.
The products named are 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 complaint says the highest-sugar option is a venti Sugar-Free Caramel Protein Matcha, with 21 grams of total sugar. It compares that amount to about five teaspoons of sugar and to nearly the amount in a standard Kit Kat bar.
The plaintiffs’ case focuses on sugar naturally present in milk, not an allegation that Starbucks added table sugar or sweetened syrups to the beverages. The complaint argues that “sugar-free” and “no added sugar” are different claims and says federal rules do not allow the “Sugar-Free” label when a serving contains more than 0.5 grams of sugar. It also alleges the drinks lack a required calorie-related disclaimer. Those are claims made in the lawsuit, not findings by a regulator or court.
A Starbucks spokesperson told Daily Coffee News that the company believes the lawsuit’s claims have “no merit” and intends to “vigorously defend” itself. The spokesperson also said Starbucks provides information about its protein beverages, sugar-free options, customization and nutritional content through product announcements, menus, marketing materials, its website and its app.
How Milk Sugar Shapes the Dispute
The case concerns whether consumers could understand “Sugar-Free” to mean a drink contains no more than the amount allowed under the relevant federal standard, even when its sugar comes naturally from milk. The complaint alleges that the product name is misleading in light of the drinks’ total sugar content.
The lawsuit focuses on whether the name communicates the drinks’ total sugar content. It does not allege that Starbucks secretly added sugar. Starbucks points to nutrition information and its use of “no-added-sugar” language for some options. The court may consider those statements alongside the product names as it evaluates the claims. No outcome has been reported.
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Protein Drinks Launched in 2025
Starbucks introduced its protein beverage lineup in September 2025, saying the products were designed to respond to consumer demand for protein. At the time, the company said its protein lattes could provide up to 36 grams of protein per grande and that protein cold foam added about 15 grams. Those figures describe the launch claims and serving sizes; they are separate from the sugar amounts alleged for venti drinks in the lawsuit.
Starbucks’ protein beverage page currently describes the lineup as including “no-added-sugar options made with sugar-free syrups,” according to the report. The complaint argues that this wording does not settle the issue because naturally occurring lactose still counts toward total sugars. The case arrives amid other disputes over coffee marketing and labeling, though the outcomes in those separate cases do not determine this one.
““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 lawsuit’s assertions remain unproven allegations. The case has only been filed, and the supplied report does not say that Starbucks has filed a response in court or that a judge has ruled on the labeling claims. It is also not clear whether the court will allow the case to proceed as a class action or what consumers would have to show to support the claims.
The dispute will require legal analysis of the relevant labeling rules and how the challenged statements appear to customers. The complaint says lactose counts as total sugar under federal regulations and alleges a calorie-related disclaimer was required. The supplied material does not include a regulator’s determination on the drinks, a court ruling on those arguments or a full account of the product labels and nutrition disclosures for every serving size.
Court Proceedings and Starbucks’ Response
The case will proceed in the U.S. District Court for the Western District of Washington, where the plaintiffs are seeking a jury trial. The next developments may include Starbucks’ formal response, motions addressing the complaint and a decision on whether the proposed class can be certified. No hearing date or ruling is provided in the report.
A decision allowing the case to continue would not itself establish the allegations. A dismissal or other court decision could affect which claims remain. The plaintiffs’ allegations and Starbucks’ response have not been resolved by the court.
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.
What sugar amounts does the complaint cite?
It alleges that venti servings contain 13 to 21 grams of sugar, with the Sugar-Free Caramel Protein Matcha at the high end. Those figures are the complaint’s claims; they have not been independently established by a court in this case.
Does the lawsuit allege Starbucks added sugar to the drinks?
No. The complaint does not allege added table sugar or sweetened syrups. It focuses on lactose, a naturally occurring sugar in milk, and argues that total sugar makes the “Sugar-Free” label misleading.
How has Starbucks responded?
A company spokesperson told Daily Coffee News that Starbucks considers the claims to have “no merit” and plans to defend itself. The spokesperson also cited the company’s nutrition and product information across its menus, website, app and marketing.
Has a court decided whether the labeling is unlawful?
No ruling is reported. The case was filed on Oct. 2, 2026, and the claims remain allegations. Whether it proceeds as a class action and how the court interprets the labeling rules are still unresolved.
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