What is the key to the Health Color Codes?

Just curious, as I noticed that there are different colors that come up when you check the health of some files. I would assume that red means it’s unhealthy, green means healthy, and yellow is in between, but what constitutes unhealthy? Malware or viruses? Or low number of peers? Or low number of seeds? I’m fairly new to torrents to begin with, so I’m kind of at a loss. Any help is appreciated! And thanks for this awesome program!

Unhealthy means low number of peers, indeed.
Never though this could be confusing. We need to reconsider this.