There must be something in the food.

"Except limes and green apples, but even then they are green too at the unready to eat stages. We had this tree back at the house that Trev and I used to play in. It was completely green, bark , leaves, fruit flowers. You name it, it was green. When we wanted to hide sometimes we'd dress up in green and climb the tree. It only worked on Naldan though. Mom and dad could always find us."