Starbucks sued over 'sugar-free' claims for protein beverages
Starbucks has been sued by consumers who said the coffee chain falsely advertised eight protein beverages ‌as "sugar-free" because they contain lactose, a naturally occurring sugar in milk.
Source: Bangkok Post Most Recent · October 6, 2026 at 10:02 AM · AI-assisted report
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SEATTLE, 6 OCTOBER 2026 —
Starbucks Faces Class-Action Lawsuit Over ‘Sugar-Free’ Claims on Protein Beverages in U.S.
Market Impact
Starbucks Corp. is being sued by consumers in a proposed class-action lawsuit alleging the coffee giant falsely labeled eight of its protein beverages as "sugar-free" despite containing lactose, a naturally occurring sugar in milk, the complaint filed in Seattle federal court on Friday states.
The lawsuit argues that the beverages—each containing 13 to 21 grams of sugar per 20- or 24-ounce "venti" serving—violate federal law, which prohibits the use of "sugar-free" for products with more than 0.5 grams of sugar per 12-ounce serving. Plaintiffs also claim Starbucks failed to include mandatory disclaimers stating the drinks are not low-calorie foods or intended for weight control, exploiting the 75% of Americans seeking to reduce sugar intake.
The eight beverages in question are the Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha, Sugar-Free Caramel Protein Matcha, and their iced equivalents. According to Starbucks’ website, these drinks—launched in September 2025 as part of its "Back to Starbucks" menu refresh—are marketed as "protein-packed" with "no added sugar," though they contain between 270 and 340 calories per venti serving.
The labels also disclose their sugar content, which stems from lactose in milk rather than added sugars.
In a statement, a Starbucks spokesperson dismissed the claims as baseless, asserting the company has "consistently and clearly provided information" about nutritional content across menus, marketing materials, its website, and the Starbucks app. The company pledged to "vigorously defend" itself against the allegations. The lawsuit seeks unspecified damages for false advertising and violations of state consumer protection laws. A lawyer representing the plaintiffs did not immediately respond to requests for comment.
The case follows a broader trend of legal challenges against food producers over misleading "sugar-free" or "zero sugar" claims, particularly for products containing sugar substitutes like allulose. While the lawsuit does not directly implicate Malaysia, it underscores growing global scrutiny over food labeling transparency, particularly as health-conscious consumers demand clearer nutritional disclosures. The outcome could influence how multinational brands like Starbucks position sugar-related claims in markets where regulatory standards vary.
The next step for the plaintiffs will be determining whether the lawsuit proceeds as a class action, with potential implications for Starbucks’ marketing strategies and legal costs. The case remains pending in the U.S. District Court for the Western District of Washington.
Related: Starbucks Corp. · U.S. District Court for the Western District of Washington · Seattle