In the book Cosmic, Liam is reading a book called Talk to your Teen. Here is an example of something that should be in the book.
Food-make sure your teen isn’t totally going crazy on junk food. You may want to limit your teen to two snacks a day. The last thing you want is an overweight teen. Also, if they can buy things freely make sure that they are not buying too much junk food. You may also want to press them to eat fruit because they will probably like it better than vegetables.