Ask Cashdoc: Is pulling out white hair bad?

It may not be visible from the outside, but when I brush my hair, I see a lot of white hairs. Is it okay for scalp health to pluck the short white hairs along the parting with tweezers? Should I take comfort in the hairdresser's comment that it's better than hair loss?

I heard that black beans or brewer's yeast are good for hair, but I wonder if they actually work. I usually eat rice with black beans and drink black bean soy milk, but I haven't seen any effects.