Fat Smash Diet - Mushrooms?

I wanted to add some mushrooms to my "veggie only" small salad for EFS and I wasn't sure if that was allowed. Can they be considered veggies? Or should I just skip them? Thank you!

You should be fine with mushrooms. He seems to be basing his choices on the glycemic index, and mushrooms rank about the same as green green vegetables. They have hardly any calories, either.