What do you think of French junk food warnings?

We all know by now that French women don't get fat. And it seems the French government is interested in keeping it that way, what with proposed taxes on junk food and laws against images depicting too-thin models. Now the French are taking their message of health to the media and running 'healthy living' ads on TV and radio stations across the nation, as well as in print. Kind of like this one on Fitsugar, which reads 'For your health, eat at least five fruits and veggies a day.'

I think if introduced in North America, these ads would be a refreshing break from all the pizza and fast foods commercials we are bombarded with on such a regular basis. But would they work? What do you think?