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“Ok so in this world the vampires are more realistic?” Naruto asked Kasumi.

“Yes the vampires here are realistic in that the reason why they drain the blood from humans is because of the fact that’s overlooked in many fictions. Blood doesn’t have enough nutrients in it to keep a human size creature fed. And that blood is 90 or something like that made of water. So like vampire bats, they pee a lot to empty out their bladders,” Kasumi explains.

“And why the vampires switch to pigs and cows to get enough blood?” Naruto asked.

“Yup as draining humans for blood doesn’t feed a vampire enough to survive for long. They just starve to death for the ones who stick to humans,” Kasumi asked. (1)

“Why are we here again?” Naruto asked as he and Kasumi are the only ones on the RV.

“Twilight wants to study the culture of this place,” Kasumi said.

“Oh,” Naruto said as he headed for his room to play some video games he has been meaning to play.

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1 - Vampires would need to pee a lot after draining people of their blood. As it’s you drinking at least four to six soda bottles and not having to pee. Then there’s the fact that blood is mostly made up of water so the nutrient is low. As unlike milk blood isn’t full of fat and nutrient. So vampires would need to feed a lot or die of hunger. Living vampires would need to either drain several humans a day just to survive or drink blood from a slaughter house.

Living dead vampires make more sense in that they drain people of their blood to replace the blood in their bodies and why they drain them dry with this kind of logic. And can go long periods of time between feedings till the blood turns rotten and needs to be replaced.