I don't have black moods. I don't even know what that is. I'm always in a good mood when I wake. I'm in a good mood most of the time. The exception is when I'm sad. I just stay home on sad days.
A cold tends to follow a blue mood by about two weeks. You can decide not to have blue moods, so you can decide not to have colds. I learned that in 1974 and I have controlled my mood to be cold free ever since.