Why does some taste sweeter than others?

Question

What is the difference in the dna make up of blood that makes some more satisfying than others??

Answer 1

it depends on the one you're drinking from.  one who resists would be sweeter than one that has no idea what's going on.  

Answer 2

Ha ha, you're crazy. But I would think it's the diet that the humans eat. If they eat healthy and include lots of fruit in their diets I'm sure their blood would taste sweeter. Vampire...