Can eating too healthily make you ill?

This article talks about Zoe and how did her eating disorder started. Zoe's mum wanted her to be a model that's why she was supporting her in her try to "eat healthy". At the beginning Zoe stooped eating meat and she only had 2 meals per day, then she stooped eating any foods that came from animals.

But it wasn't enough healthy for her so she stooped the consumption of salt, sugar and processed food, finally she ended up living on popcorn and cranberry juice for a year. Zoe kept loosing weight and getting sick constantly. She was stressed out at school and sleeping whole weekends.

The article says that like Zoe there is a rising number of teens developing "orthorexia" that is an obsession with healthy food.