This week, the New York Times editorial board wrote in support of greater taxes on sweetened drinks, citing new research from a team Mexican and American researchers. They praise the novel design of the tax, which is levied on drink distributors rather than consumers. This caused the tax to be included in shelf prices, making the increase in total cost clear to consumers. The research found that soda consumption fell 12 percent in a year, and 17 percent among the poorest Mexicans.

The Times admits that we do not know whether any health benefits will actually result from soda taxes. In this article in Regulation, the University of Pennsylvania’s Jonathan Klick and Claremont McKenna’s Eric Helland examined the effects of soda taxes. They conclude that a one percent increase in soda taxes led to a five percent reduction in soda consumption among young people. But consumers substituted to other beverages. A 6‑calorie reduction in soda consumption was accompanied by an 8‑calorie increase in milk consumption and a 2‑calorie increase in juice consumption. Thus, the tax on soda led to an increase in overall calorie consumption, which offset the benefits of falling soda consumption. Moreover, there was “no statistically significant effect of soda taxes on body weight or the likelihood of being obese or overweight”.