Though it may not 'feed' candida directly, when you have candida issues, you can react to yeast in foods. In fact, I used to feel the effects when consuming a spread containing yeast in it. Though it was healthy and contained much B vitamins, there were still issues with the yeast. Indirectly yeast in foods may encourage candida to grow due to causing reactions/allergic etc.

It depends how you react. You "maybe" ok, you may not. I used to be relatively ok consuming non gluten breads and to be honest, I cannot recall if they contained yeast or not. I was once ok with non wheat/gluten breads though and enjoyed them. I cannot eat any high carbohydrates now though, even if they are non gluten.