User blog comment:Supahbadmarine/Andromeda Xeno Lab/@comment-10514705-20110622191252/@comment-2253300-20110622205536

That is an interesting idea, but the C'tan of the MW galaxy don't feed on living beings to survive. They fed on the power of the Stars before, remember? I believe that it has been stated that the C'tan began to feed on living things because they were not as "Bland". Though I may be wrong.