When talking about food, talk about all foods in a positive or neutral way. This means having pizza for dinner is just as healthy as having chicken and broccoli.
By avoiding “fun foods” like pizza, fries, candies, and cakes, you set your teen up to believe that these foods are “bad.” If they think these foods are bad, they will do their very best to avoid them. Think back to when your teenager was a child: what did they do when they were told they couldn’t have something? They wanted it even more! Our body knows when we are restricting (even cognitively!) and will do everything in its power to make sure it gets what it wants.