Yes. Yes it is. Just because they have lots of fancy candy packaging doesn't mean that Japanese kids eat tons of it.
http://en.wikipedia.org/wiki/Epidemiology_of_obesity#Japan
Just look at photos of what the Jap kids eat for lunch:
http://www.flickr.com/photos/lunchinabox/1378172475/
This is actually what they eat for lunch everyday. It's amazing.