User blog comment:Charlie618/Question/@comment-137.147.179.63-20130216205820

Ok, all human blood smells different to every Vampire, some more appealing than others. Sometimes a Vampire will find a human that they cannot resist or control themselves around because they want their blood badly, these are called their singers. Bella was Edward's singer but he learnt to become used to being around her and to control himself. Hope this answers your question.