Well you can get food with out your parents knowing by sneaking in the kitchen when they do not see you and take some food but if you are in school you can just by stuff and they will not know but...
Junk food is things that have sugar or caffeine in it. Ex. candy is a bad habit of children. Children these days are overweight. One child is over 400 lbs. That's are not good. !!! how bad are they...