[shagmin]

Calories conventionally come from grains. If you measure cabbage's nutrition by its minerals and vitamins it packs quite a punch.

[glutamate]

Apparently protein as well? I remember reading that cabbage is the highest yield protein per acre. It's just wrapped in a whole bunch of greens you have to munch through first.

[gsbraitberg]

Cabbage yields about 1000 lbs protein per acre, vs 3000 lbs protein per acre for soybeans.