You should ask, why do they eat it! I've thought about this stuff. I've actually thought about the candles. The candles are people's souls that were taken by Death or by the vampires. In Japan there are candles that represent life. So, when you release the souls from the candles by whipping them, they give you a "thank you" present. Thank-you hearts, or thank-you holy water. The meat, I have no idea.