Federal agencies are putting the spotlight on food marketing practices. McDonald’s spent $321 million on radio advertising last year. But how the fast food company allocates its budget may change as the federal government takes a closer look at childhood obesity. 

Several agencies, including the Food and Drug Administration and the Federal Trade Commission are looking to create "voluntary principles" to follow, which may mean limiting ad exposure of unhealthy foods to children 17 and younger.

According to Business Week, the agencies insisted in their announcement released yesterday that these will not be government "mandates".  But food, beverage and restaurant representatives say they are already feeling increased pressure from Washington.