Starbucks "Sugar-Free" protein latte and matcha lawsuit (Walsh v. Starbucks)

Three Starbucks customers filed a proposed class action on October 2, 2026, claiming that eight protein drinks sold with "Sugar-Free" at the start of their names contain 13 to 21 grams of sugar in a venti size. The case is Walsh v. Starbucks Corporation, No. 2:26-cv-03745, in the U.S. District Court for the Western District of Washington in Seattle.

The sugar comes from milk. Milk naturally contains lactose, and federal nutrition rules list lactose as a sugar. The plaintiffs say federal rules allow a "sugar free" claim only when a serving has less than 0.5 grams of sugar, so the names are false no matter where the sugar comes from.

Starbucks says the claims have no merit. It says it adds no sugar to these drinks, flavors them with sugar-free syrup and has clearly disclosed nutrition information. No court has ruled, no class has been certified and there is no settlement or claim form.

Starbucks Corporation is the Seattle-based coffee chain. It sells coffee, tea and other drinks at thousands of U.S. stores, through its website and mobile app, and through delivery apps such as DoorDash, Uber Eats and Grubhub. The complaint says Starbucks decided the names and marketing of the protein drinks at its Seattle headquarters. That is why the plaintiffs sued in Seattle and ask the court to apply Washington law to buyers nationwide.

The plaintiffs describe themselves as regular customers. According to the complaint, Michael Walsh of Whittier, California, bought the drinks from about June to August 2026. Anne Legnini of Montgomery, New York, bought them from about September 2025 to August 2026. Elna Potter of Kelso, Washington, bought them in nearby Longview from about April to September 2026. Each says they read "Sugar-Free" to mean no sugar and did not see the sugar content before buying.

They are represented by Hagens Berman Sobol Shapiro LLP and Sterlington PLLC. Hagens Berman's case page lists Judge Brian A. Tsuchida as the assigned judge.

On September 2, 2025, Starbucks announced a new line of protein lattes and protein cold foam. The complaint quotes the announcement as promising "sugar-free and unsweetened choices." The drinks went on sale on or about September 29, 2025, at about $6 to $8 each, according to the complaint.

The eight drinks named in the lawsuit are the 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 reproduces Starbucks' own nutrition figures for a venti, which is 20 ounces hot or 24 ounces iced. It lists 19 grams of sugar for each hot latte, 20 and 21 grams for the hot matchas, 13 grams for each iced latte and 17 grams for each iced matcha. It says the drinks have about 270 to 340 calories in a venti. The Associated Press reported that Starbucks' website on October 5 listed 16 grams of sugar in a 16-ounce Sugar-Free Caramel Protein Matcha.

According to the complaint, Starbucks' launch materials said two of the drinks had "no added sugar" or were made "without the added sugar." The plaintiffs argue that "no added sugar" is a separate claim with its own rules, and that "Sugar-Free" in a product name promises something different.

The plaintiffs make two main arguments. First, they say a federal rule, 21 C.F.R. 101.60(c)(1), allows "sugar free" only if a food has less than 0.5 grams of sugar per standard serving, which they say is 12 ounces for coffee drinks. By their math, the drinks contain about 13 to 26 times that limit. Second, they say the same rule requires "sugar free" to appear with a statement such as "not a low calorie food" unless the product is low or reduced in calories, and that Starbucks never uses one.

They say the case is about misleading product names, not missing nutrition labels, and that buyers paid for drinks that did not match their names. They also cite the Seventh Circuit's July 2026 decision in Franco v. Chobani, which held that allulose counts as a sugar under the federal rule, and argue that lactose is an easier case because the regulation names it.

The complaint brings eight counts: the Washington Consumer Protection Act, three counts under California's Unfair Competition Law plus its False Advertising Law, the California Consumers Legal Remedies Act, New York General Business Law sections 349 and 350, breach of the implied warranty of merchantability and unjust enrichment.

Starbucks disagrees. A spokesperson told the Associated Press: "We believe these claims have no merit. Starbucks has consistently and clearly provided information about its protein beverages, sugar-free options, customization choices and nutritional content across product announcements, menus, marketing materials, Starbucks.com and the Starbucks app, and we intend to vigorously defend ourselves in this matter." The company also said the sugar comes from protein-boosted milk, that it adds no sugar and that it uses sugar-free syrup.

The docket shows the complaint filed on October 2, 2026, and summonses issued on October 5. Starbucks had not filed a response in the docket entries available on October 20, 2026.

The court has not decided whether the names are misleading, whether the federal rule applies the way the plaintiffs say, whether Washington law can cover buyers in every state or whether a class should be certified.

The complaint proposes a nationwide class and, as a backup, three state subclasses. The court decides later who, if anyone, is in a class.

The groups exclude Starbucks and its officers, directors and employees, companies Starbucks controls, the assigned judge and the judge's immediate family, and the plaintiffs' lawyers. That means Starbucks employees who bought the drinks fall outside the proposed groups.

There is no claim form and no deadline. Buyers can:

• Check Starbucks app order history or card statements for purchases of the eight drinks since September 29, 2025.
• Note the drink, size and store where possible. The complaint says Starbucks keeps transaction records showing the drink, date and location.
• Watch for a class certification ruling or settlement notice.
• Contact Hagens Berman or their own lawyer with questions.

No money is available now. The complaint asks for a declaration that the names are unlawful, an order barring Starbucks from using "Sugar-Free" on drinks that contain sugar, restitution, actual, statutory or multiplied damages, punitive damages where state law allows, interest and attorneys' fees. These are requests, not awards.

• September 2, 2025: Starbucks announces its protein drinks.
• September 29, 2025: The drinks launch, starting the proposed class period.
• July 27, 2026: The Seventh Circuit decides Franco v. Chobani.
• October 2, 2026: The complaint is filed.
• October 5, 2026: Summonses issue, and Starbucks' statement is reported.

No opt-out, objection or claim deadlines exist. If a class is certified or a settlement is reached, a notice would explain members' options, including any right to exclude themselves.

• Lactose: The natural sugar in milk. Federal nutrition rules list it as a sugar.
• Nutrient content claim: A statement about how much of a nutrient a food contains, such as "sugar free" or "no added sugar."
• Reference amount customarily consumed: The standard serving size regulators use to judge nutrient claims. The complaint says it is 12 ounces for these drinks.
• Implied warranty of merchantability: A legal promise that a product is fit for ordinary use and matches its label.
• Restitution: Returning money a company gained unfairly.
• Class certification: A court's decision that a case can go forward on behalf of a group.

Starbucks must answer the complaint or ask the court to dismiss it. Its public statement points to the nutrition details it publishes, but it has not made any argument in court yet. The judge would then decide whether the claims can proceed before any question of class certification.

Class Action Pulse also tracks sugar-labeling suits against Dunkin' and Costco, which involve allulose rather than milk sugar. Our news report covers the filing in more detail.

A practical note: app order history is the simplest record here, because many of these drinks are bought at the counter or drive-through without a kept receipt.

This article relies on the complaint, the court docket, Hagens Berman's case page, the Associated Press report, NBC News and the Seventh Circuit's Franco v. Chobani opinion.

The sugar multiples, the reasons behind the names and any price premium are allegations. Starbucks' statements were given to reporters and are not court filings. The judge assignment comes from plaintiffs' counsel because the docket text is not public. Sales volume and the number of buyers are unknown.

Class Action Pulse is not a law firm or settlement administrator and does not guarantee eligibility or payment. This article is general information, not legal advice.