[umeshoyu]

These foods are too yin and have an excessive amount of yin vitamins, minerals and nutrients without balancing yang factors.

Also, they are favored by the modern public. This is because they somewhat balance a heavy animal based diet (yang). This is another indication that they are very yin. You don't see many people eating yang vegetables like burock, lotus root, or hard fiberous leafy greens like kale, watercress, collards, etc., except in some places.
A carrot burdock kimpira wouldn't compliment a steak like sauteed spinach or asparagus with butter. But spinach or asparagus don't compliment a riceball so well either...they are too yin.

thanks.