Why do consumers say Starbucks violated federal labeling rules with its protein beverages?

Consumers argue that lactose gives the beverages 13 to 21 grams of sugar per venti serving, making the sugar-free label misleading. The complaint cites a federal limit that bars describing a beverage as sugar-free when it contains more than 0.5 grams of sugar per 12-ounce serving.

Starbucks sued over 'sugar-free' claims for protein beverages

Q: What beverages are included in the Starbucks sugar-free labeling lawsuit?

The lawsuit covers eight beverages: Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha and Sugar-Free Caramel Protein Matcha, plus iced versions of each drink.

Q: How has Starbucks responded to the lawsuit over its protein drinks?

A Starbucks spokesperson said the claims have no merit and that the company has consistently provided information about the beverages’ sugar-free options, customization choices and nutritional content through menus, marketing materials, its website and app. Starbucks said it would vigorously defend itself.

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Summary

Consumers sued Starbucks in federal court in Seattle, alleging the chain falsely labeled eight protein beverages as sugar-free despite their lactose content. The beverages contain 13 to 21 grams of sugar per venti serving, while federal rules cited in the complaint prohibit the sugar-free label above 0.5 grams per 12-ounce serving. Starbucks denied the claims and said it would defend itself.

Key Facts

The proposed class action seeks unspecified damages for alleged false advertising and violations of various state consumer protection laws.
The eight beverages include Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha and Sugar-Free Caramel Protein Matcha, along with iced versions.
Starbucks said its website lists the beverages as containing no added sugar while also displaying their sugar content.
Venti servings contain between 270 and 340 calories, according to Starbucks’ website.
Starbucks launched the beverages in September 2025 as part of its updated Back to Starbucks menu.

By Reuters

Published Oct 6, 2026 3:45 am KST

A Starbucks sign is displayed in the Galleria Mall in Buffalo, N.Y., Aug. 26. AP-Yonhap

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.

According to a proposed class action filed on Friday, reasonable consumers would not expect the beverages to contain 13 to 21 grams of sugar per 20- or 24-ounce "venti" serving.

Federal law prohibits Starbucks from using "sugar-free" to describe beverages containing more than 0.5 grams of sugar per 12-ounce serving, the complaint said.

Consumers accused Starbucks of trying to capitalize on the desire of 75 percent of Americans to reduce or eliminate sugar consumption. They also said Starbucks failed to provide federally required disclaimers that the protein beverages are not low-calorie food or meant for weight control.

A Starbucks spokesperson said in an email that the 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," the spokesperson said.

A lawyer for the consumers did not immediately respond to requests for additional comment. The complaint in Seattle federal court seeks unspecified damages for false advertising and violations of various state consumer protection laws.

Food producers are regularly sued for alleged false advertising, including in dozens of recent cases challenging "sugar-free" or "zero sugar" claims for products containing a sugar substitute known as allulose.

The eight Starbucks beverages are Sugar-Free Vanilla Protein Latte, Sugar-Free Caramel Protein Latte, Sugar-Free Vanilla Protein Matcha, Sugar-Free Caramel Protein Matcha, and equivalent versions containing ice.

Starbucks' website says the beverages are "protein-packed" with "no added sugar," and venti servings contain between 270 and 340 calories. The website also shows that the beverages contain sugars. Starbucks launched the beverages in September 2025 as part of its "Back to Starbucks" updated menu.

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