Can cabbage leaf (stalk leaf not the outer leaf) be eaten? I am growing white cabbages and as the cabbage heart develops there are other leaves growing below the heart off the main plant stalk.  Can these leaves be eaten?

I am not referring to a cabbage in which the outer leaves are discarded, say when purchased and the outer leaves are damaged/soiled.
Found a few places suggesting it's safe (and nutritious) to eat the cabbage stalk/lower leaves:


University of Florida
Gardening Know How
Sainsbury’s