By Elise Viebeck - 06/18/13 03:31 PM EDT
The WHO has reported that on average, one in three children between the ages of 6 and 9 is overweight or obese.
Obesity among U.S. kids has more than doubled in the past three decades, according to the Centers for Disease Control and Prevention, and health advocates see growing waistlines as an unfolding crisis.
The Obama administration has sought to crack down on school-based sales of unhealthy snacks and promote fitness through first lady Michelle Obama's "Let's Move!" campaign.
The Walt Disney Co. has also partnered with Obama to implement nutrition standards for the foods it markets to younger viewers.
The American Academy of Pediatrics and others have urged Nickelodeon to make a similar pledge. The network says it's been on the cutting edge of fighting childhood obesity through positive advertising.
WHO Europe said in a report that food ads are effective with kids because, as an audience, they can't distinguish between marketing and cartoons.