"Bloomberg ... has the right to be crazy, but he doesn't have the right to come here and impose his craziness on us," said Cuauhtemoc Rivera, leader of Mexico's National Association of Small Stores, a little-known business chamber that bought full-page ads in Mexico's main newspapers for several days running.
Rivera acknowledges that big soft drink bottlers and sugar growers have contributed to the anti-tax ad campaigns. "Between us all we are financing this campaign," Rivera said.
Bloomberg Philanthropies says it has donated $10 million in an effort with "top research and advocacy organizations" to support goals such as "raising taxes on sugar-sweetened beverages." But Bloomberg's group would not say how much, if any, of the money went for ads in Mexico.
The anti-tax side, though, has taken out far more ads than pro-tax advocates.
The beverage industry is among the biggest retail money-makers and ad buyers in the country. Rivera estimated that soft drink sales account for 40 percent of income at small Mexican stores.
Mexico's largest soft-drink bottler, Coca Cola-Femsa, says it hasn't purchased any ads in its own name. But Coca Cola-Femsa spokeswoman Guadalupe Gonzalez said in an email that Mexico's National Soft Drink and Bottled Water Producers' Association, to which the company belongs, has run ads, along with cane growers and retailers.
Supporters of the tax say they have been prevented from buying billboard and television space for their own anti-obesity and pro-tax ads because media companies don't want to alienate bottlers.
Alejandro Calvillo, head of the nonprofit group Consumers' Power, says two billboard companies turned down his group's print ads. "They told us they didn't want to get into trouble with other advertising customers," he said.
Calvillo said Mexico's main television networks have also refused to run pro-tax ads.
The largest, Televisa, said it had no record of receiving a request to buy airtime.
The other network, TV Azteca, told The Associated Press in a message that a proposed pro-tax commercial "has been reviewed, and there are legal and ethical impediments to airing it," including "several people are portrayed as being doctors" without showing their professional licenses on air.