Hoi Folks,
Dark meat is "dark" due to the chemical structures in the tissue that allow long term use, i.e. muscles marathon runners use to run the distance. These "dark" structures allow for aerobic respiration. White meat is "white" due to its chemical structures that allow anaerobic cellular respiration, i.e. breast muscles in chickens that do not get used except for postural motion, quick burts of motion.
The "dark" meat has fat stores throughout, allowing a ready supply of fuel. This fat is considered bad, I am not shore why. Most of our health problems are caused by how we use ourselves, not so much by what we eat. The body does seem to have the ability to communicate what it "needs" to eat, and via these mechanisims a proper diet may be achieved.
Hope that helps.
Take care
drb