There IS a food/ADHD connection, backed by research. It's not as simple as "take out gluten," or something like that, but evidence suggests that many of these kids have food allergies or sensitivities and that figuring this out can help. Snacking, though? SNACKING causes ADHD? Snacking causes obesity, sure.

The sleep connection is certainly something to be concerned about. Do French kids get a lot of sleep? I don't know. I'm inclined to doubt it--Europeans tend to put their children to bed late, according to my European friends.