In March 2015, the city of Berkeley, California was the first U.S. city to impose a tax on sugary drinks. One cent was charged for every ounce sold. The tax impacted sugary sodas, juices, energy drinks, and coffee drinks. Four months after the tax was levied, researchers compared consumption of sugary drinks in Berkeley to two neighboring cities, Oakland and San Francisco, which do not have a sugary drink tax. They discovered that in Berkeley, consumption of sugary drinks dropped by 21% after the tax was imposed while over the same time period, consumption increased by 4% in the other cities. Researchers also discovered that Berkeley consumers drank 63% more water.
Conclusion: A sugar tax really might help to cut down on sugar consumption.