A reader named Karl alerted me to a bill (H.R. 6599) introduced by Dennis Kucinich (D-OH) in the 112th Congress. The official name of the bill is the Stop Subsidizing Childhood Obesity Act.
The law would:
amend the Internal Revenue Code of 1986 to protect children's health by denying any deduction for advertising and marketing directed at children to promote the consumption of food at fast food restaurants or of food of poor nutritional quality.
I suppose it is less draconian than the ban on childhood advertisements that have been proposed by some, but I'd be amused to see the lobbying that would go on to define "fast food" and "poor nutritional quality" in the unlikely event this makes it out of committee.