Many of the dietary and health regulations listed in Deuteronomy and Leviticus are just plain common sense. It seems that many of the animals, fish, and birds listed as unclean are those who either eat meat or are scavengers.

Lev 17:11
For the life of a creature is in the blood, and I have given it to you to make atonement for yourselves on the altar; it is the blood that makes atonement for one's life.

Couldn’t help but think of Jesus on this one. It is through His shed blood that we have atonement for our sins.

Col 1:19-20
For God was pleased to have all his fullness dwell in him, and through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross.