Plasma

Plasma is the Sim-equivalent of blood. It is used by Vampires in The Sims 3: Late Night to satisfy their thirst motive, which they have instead of hunger. As stated in a Twitter session with Grant Rodiek, vampire Sims will also be able to grow plasma fruits at night in their own personal gardens, and buy them at the grocery store and hospital. Vampires will also be able to eat plasma packs, which function the same as snacks for human Sims. If Vampire Sims have the Vegetarian trait, they are limited to only plasma fruit. If a regular Sim ingests any plasma product then they will immediately turn into a vampire.