My niece and nephew who are teenagers now were raised a relatively strict diet as kids, nothing crazy just not much "junk" and lots of veggies for snacks etc. For them it carried over into their teen years and they actually prefer it now when given a choice. They sort of just naturally eat healthier and perhaps it has to do with those formative years.
I am going to drink a redbull and ponder it :)
Lol. A Red Bull, seriously?
Make sure you wash that down with a donut.