Starbucks Faces Class Action Over “Sugar Free” Protein Drinks

A new class action lawsuit accuses Starbucks of misleading consumers by selling beverages labeled “Sugar-Free” that can contain up to 21 grams of sugar. At issue is the distinction between “sugar free” and “no added sugar,” two terms that are treated differently under federal food-labeling regulations.

The lawsuit, Walsh v. Starbucks Corporation, Case No. 2:26-cv-03745, was filed October 2, 2026, in the U.S. District Court for the Western District of Washington. The plaintiffs seek to represent a nationwide class of consumers who purchased eight Starbucks protein beverages introduced in September 2025. Alternatively, they seek certification of separate classes in California, New York and Washington.

What the Lawsuit Alleges

The complaint challenges Starbucks' use of “Sugar-Free” in the names of its vanilla and caramel Protein Lattes and Protein Matchas, including hot and iced versions.

According to the complaint, Starbucks' own nutritional information shows that the eight beverages contain between 13 and 21 grams of sugar per venti serving. The plaintiffs attribute the sugar to lactose, a naturally occurring sugar found in milk. For example, a venti Sugar-Free Caramel Protein Matcha is listed as containing 21 grams of sugar, while a venti hot Sugar-Free Vanilla Protein Latte contains 19 grams.

The plaintiffs contend that consumers ordering drinks advertised as sugar free reasonably expect them to contain little or no sugar. They claim they would not have purchased the beverages, or would have paid less for them, had they known their actual sugar content.

Starbucks publishes nutritional information about its drinks, a fact the plaintiffs acknowledge. But the complaint alleges that the information can be difficult to find in certain online ordering channels. The plaintiffs include screenshots intended to show how sugar content may be obscured by a website footer or require scrolling to view it. They do not contend that Starbucks is required to display sugar content on its menus. Their argument focuses on the product names themselves.

Starbucks disputes the allegations. In a statement reported by Reuters, the company said the claims lack merit, emphasized that it provides nutritional information about its beverages, and indicated that it intends to defend the lawsuit.

What Does “Sugar Free” Mean Under FDA Regulations?

Federal regulations establish specific requirements for products marketed as sugar free.

Under 21 C.F.R. § 101.60(c)(1), foods and beverages generally may be labeled “sugar free,” “zero sugar,” or with similar terminology only if they contain less than 0.5 grams of sugar per reference amount customarily consumed and per labeled serving, along with meeting other regulatory conditions.

According to the complaint, all eight Starbucks beverages exceed that limit even when their sugar content is calculated using the FDA's 360-milliliter reference amount for ready-to-drink coffee and tea beverages.

The FDA's definition of total sugars, found in 21 C.F.R. § 101.9(c)(6)(ii), expressly includes lactose, regardless of whether that sugar occurs naturally in an ingredient.

The regulations also distinguish between “sugar free” and “no added sugar.” The latter is separately regulated under Section 101.60(c)(2) and may be used for products containing naturally occurring sugar, provided the applicable requirements are met.

When Starbucks introduced its protein beverages in September 2025, its product announcement described certain offerings as having no added sugar. But the names of several beverages included the term “Sugar-Free.” The plaintiffs contend that calling the finished beverages sugar free communicates something different from saying that no sugar has been added.

The complaint also raises a separate issue involving calories. Under Section 101.60(c)(1)(iii), a product labeled “sugar free” generally must satisfy specified calorie-labeling requirements or immediately accompany the claim with a statement such as “not a reduced calorie food” or “not for weight control.” The challenged Starbucks beverages reportedly contain about 270 to 340 calories per venti serving, and the plaintiffs allege they do not meet these requirements.

These nutrient-content rules also apply to restaurant foods, subject to certain exceptions, under 21 C.F.R. § 101.13(q)(5).

The Seventh Circuit's Recent Chobani Decision

In July 2026, the Seventh Circuit addressed a similar sugar-free labeling dispute in Franco v. Chobani, LLC, 184 F.4th 599 (7th Cir. 2026).

Consumers had sued Chobani over yogurt marketed as sugar free despite containing four grams of allulose per serving. The appeals court reversed the dismissal of the lawsuit, concluding that allulose fell within the FDA's regulatory definition of sugar, that the plaintiffs had plausibly alleged consumer deception, and that their state-law claims were not preempted on the grounds considered by the court.

The ruling allowed the lawsuit to proceed without determining whether Chobani was liable. It is not binding on the federal court hearing the Starbucks case.

The Starbucks plaintiffs cite Franco in their complaint. Unlike allulose, lactose is expressly identified in the FDA's definition of sugars.

Claims Under California Law

Although the lawsuit was filed in Washington, the complaint includes claims under California's Unfair Competition Law (Business and Professions Code § 17200), False Advertising Law (§ 17500), and Consumers Legal Remedies Act (Civil Code § 1750).

The California claims rely in part on the state's Sherman Food, Drug, and Cosmetic Law, which incorporates federal food-labeling requirements into California law. The plaintiffs allege that Starbucks' failure to comply with those requirements constitutes an unlawful business practice under California's Unfair Competition Law.

The federal Food, Drug, and Cosmetic Act generally does not permit private parties to enforce its provisions directly. Consumers may, however, pursue certain state-law claims based on violations of equivalent state requirements. The plaintiffs rely on that distinction in pursuing their California claims.

Takeaways to Consider

The Starbucks lawsuit highlights the importance of precision in product names and marketing claims, particularly when using terms governed by FDA regulations. Descriptions such as “sugar free” and “no added sugar” may sound similar, but they carry different regulatory requirements.

Companies should review these requirements when developing product names and marketing materials and ensure that claims are consistent with the products being sold. They should also be careful not to rely on nutritional disclosures elsewhere to clarify potentially misleading product names.