Also, isn't drinking human blood dangerous? Can't one contract diseases? Again, all of this is out of sheer curiosity. Thank you!

Well, actually that's why the donors needs to be healthy, and free from any blood diseases... well free from any disease. And I think I read some interesting things coming from "guardianofeden". Let me explin just few things:

Real vampires Do eat normal food, cause they're not too much different from "humans" (they prefer to call them non-vampires), however, the need of drinking blood is big!!! but the frequency depends of the vampire.

And the "type" of energy that derives from drinking blood is simple: Makes you happy and when you're happy you have energy. Well it is like when your favorite food is.... Ice Cream by example, and you are able to eat it whenerver you want. But you have time without taste the flavor of an ice cream, when you finally eat one, feels like some kind of power within. Besides the sangs admire the flavor, look and smell of blood. Also the blood for natual causes gives them energy, cause is a NATURAL need.

There's so much more to explain. Is not that simple as it looks.

does it make you sang if you like the taste of blood, but you don't need it to function on a regular basis?

Do Sangs Need Blood Or Do They Just Want It?