Berkeley’s low-income neighborhoods saw a 21 percent drop in consumption of soda and other sugary drinks in the months after the city introduced a tax of one cent per ounce on such beverages, new research shows.

The findings from the first U.S. city to combat sugar-related health risks and raise revenue with a tax on sugary drinks is encouraging news for the four other cities voting on measures this fall, and for Philadelphia, where a new tax is being implemented.