The newly appointed president of the Institute of Medicine (IOM), which advises government leaders and policymakers on health issues, plans to resign from several corporate boards in advance of taking his new job -- including one that might have created a sticky situation. Among the companies that Victor Dzau will sever ties with is PepsiCo, according to Jennifer Walsh, a spokeswoman for the IOM. For Dzau, who's leaving his position as CEO of the Duke University Health System to head up the IOM, the PepsiCo relationship might have been a problem: Several of the company's products are among those blamed for contributing to the obesity epidemic in the US. Dzau's board affiliations, as well as his pay at Duke, have drawn flak in the past.