In addition to the needless animal cruelty involved in killing animals to eat their flesh (Proverbs 12:10), asking God to have dead bodies nourish our body is like asking him to have cigarettes and alcohol nourish our body (James 4:3). He told us what is good and nourishing in Genesis 1:29 and has instructed us to take care of our bodies (1 Corinthians 6:19). We should therefore follow his instructions (Isaiah 1:19, 1 Kings 3:14) instead of asking him to bless our disobedience (Genesis 6:12, Titus 3:3).
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Swords to Plowshares 