I had a very good question from a client a few days ago, and thought I would post about it.
One of Ic and Caly's babies is going to a family, in which a child has a nut allergy. For their family, they could never have a Macaw, or too many of the other large species of parrots because in their diets they require nuts. But this got me thinking, so I made sure that there is a food that could be used.
The mix that we wean the babies too has no nuts in it, but is made in a mill that does work with nuts, so there may be trace elements.
Always check labels! I have noticed that lots of treats contain nuts! Nurtuberries contain nuts! And most other treats that I looked at and checked labels contained some form of nut.
When in doubt, use a pellet only diet with lots of supplemented veggies and fruits for your Green Cheek Conure. I also then suggest twice weekly proteins of chicken, a small amount. They LOVE it!