(NEW YORK TIMES) — Big Gulps are safe. But the fate of the Frappuccino remains unclear.

As the Bloomberg administration moved ahead on Tuesday with its plan to restrict sales of big sugary drinks in New York, securing a preliminary nod from the city’s Board of Health, it said it is still trying to determine the impact on one popular beverage brand: Starbucks.

Mayor Michael R. Bloomberg’s plan, which would limit the size of sweet drinks sold at many establishments to 16 ounces or less, exempts any beverage that contains more than 50 percent milk by volume. Officials in City Hall and in Seattle said they were unsure how those rules might affect the Starbucks family of syrupy, milkshake-style coffee drinks, catnip to thousands of caffeine-addicted New Yorkers who frequent the company’s 190 outlets in Manhattan.

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