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News — Eight cities in the United States have implemented , which contribute to health issues including obesity and Type 2 diabetes.

New research from the University of Washington investigated responses to sweetened beverage taxes using the purchasing behavior of approximately 400 households in Seattle, San Francisco, Oakland and Philadelphia – all of which recently introduced beverage taxes. was published online Sept. 30 in Health Economics.

Researchers found that after the tax was introduced, lower-income households decreased their purchases of sweetened beverages by nearly 50%, while higher-income households reduced purchases by 18%. Since previous studies have shown that lower-income individuals consume sweetened beverages at a higher-than-average rate, these results suggest the taxes could help reduce health disparities and promote population health.

“If households reduce their sugar intake, they will experience health benefits,” said , co-author and UW associate teaching professor of economics. “Sweetened beverages are one of the largest sources of sugar in the American diet. They have all kinds of health consequences and don’t really provide any nutrition. The idea with the tax is that lower-income people, because they reduce their intake more, receive greater health benefits than the higher-income households.”

Using , researchers followed the households for a year before and after the tax was implemented in their city. Consumers were given a handheld scanner to report their purchases.

The results showed that households experienced price increases for taxed beverages, with the difference persisting for at least one year post-tax. Price increases were largest for lower-income households – a 22% increase in sweetened beverage prices versus 11% for higher-income households. After the tax was implemented, lower-income households saw a 47% decline in purchases of sweetened beverages. Researchers didn’t observe a post-tax increase in cross-border shopping.

“We also looked at untaxed beverages and found that lower-income households are substituting with untaxed beverages,” Knox said. “They’re using some of their money to go buy a different beverage, rather than buying a candy bar instead of buying a Coke.”

Policy makers are particularly interested in the response of lower-income consumers due to their higher consumption on average of sweetened beverages and concerns that the taxes are regressive.

found that lower-income and higher-income households paid about the same amount toward the tax, which means lower-income households spent a higher proportion of their income. But the study also showed more dollars went toward funding programs that benefit lower-income communities than those households paid in taxes. The annual net benefit to lower-income communities ranged from $5.3 million to $16.4 million per year across three U.S. cities.

More found the tax was also associated with declines in childhood body mass index among children in Seattle compared to a well-matched comparison group.

“Together, this body of work suggests the tax is having the intended health benefits and this new evidence gives reason to believe health benefits could be larger for households with lower incomes,” said , co-author and UW professor of health systems and population health.

The research was funded by the UW’s Royalty Research Fund and the Robert Wood Johnson Foundation. Partial support was provided by a Eunice Kennedy Shriver National Institute of Child Health and Human Development research infrastructure grant.

For more information, contact Knox at [email protected] and Jones-Smith at [email protected].