Starbucks faces class-action lawsuit over 'sugar-free' protein drinks

A federal class-action lawsuit filed in Seattle claims eight Starbucks protein drinks labeled 'sugar-free' in the U.S. contain sugar, with a 16-ounce Sugar-Free Caramel Protein Matcha listed at 16 grams. Starbucks says the sugar comes from its protein-boosted milk and that no sugar is added, calling the claims meritless.

• Suit filed in Seattle on behalf of three consumers in California, New York and Washington
• 16-ounce Sugar-Free Caramel Protein Matcha lists 16 g of sugar; 20-ounce version 21 g
• Starbucks says sugar comes from protein-boosted milk, no sugar added
• Plaintiffs seek damages and an order to stop using the 'sugar-free' label