A recent public health survey of 20 California high schools representing a variety of ethnic and economic backgrounds found that nearly 65 percent of vending machine ads and 71 percent of logos displayed on sports equipment were for soda and other sweetened beverages.

The Food and Beverage Marketing on California High School Campuses Survey also found that 60 percent of product posters and signage in schools promote "discouraged" foods and beverages high in sugar, sodium and fat such as candy, cookies, chips, soda and sports drinks, says Sarah Samuels, president of Samuels & Associates, the research firm that conducted the study with funding from The California Endowment.