The US kids thought burger chains pretended their food was healthier than it really was.
And they said there wasn't enough information about how bad it could be for your health if you ate it all the time.
'Up to you'
So they went to court and tried to sue.
He also said it was up to people to watch what they ate, and not the responsibility of the law.
Most of the teenagers lived on a daily diet of burgers and fries from the restaurant.