Article The following is an excerpt from askfrfrancis.org. Fr. Francis Ching, CC answers tough questions about the Catholic faith.
Question: 
Is it true that the host already contains the blood and the body of Christ? If so, during Holy Communion at Mass, why do we have to receive bother the body and blood? Can we just receive the body and suffice?
Fr. Francis’ answer:

Praise the Lord

Read more ... http://www.companionscross.org/