The majority of voters in San Francisco and Berkeley, Calif., voted in favor of a soda tax, but the measure didn't gain the required two-thirds majority required in San Francisco. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

A mock-up of a warning label for sodas and sugary drinks proposed in California by public health advocates. California Center for Public Health Advocacy hide caption

itoggle caption California Center for Public Health Advocacy

Even seemingly healthful foods can contain unexpected spoonfuls of sugar. Meg Vogel/NPR hide caption

itoggle caption Meg Vogel/NPR

Tractors sit on a sugarcane plantation on the land of a Guarani-kaiowá indigenous community in Brazil. Tatiana Cardeal/Courtesy Oxfam hide caption

itoggle caption Tatiana Cardeal/Courtesy Oxfam

A performer drinks a soda in Ahmedabad, India in 2010. A study found that rising diabetes prevalence in countries like India is strongly tied to sugar consumption. Sam Panthaky/AFP/Getty Images hide caption

itoggle caption Sam Panthaky/AFP/Getty Images