Here is a post by a friend of mine about the Ka and food:
Aset is a goddess of the Ka as a goddess of family inheritance, ancestral lines and magic. And the Ka inherent in food is how wee feed our souls and nourish our bodies. These are sacred things. The Ka is apart of your soul, it is your life-force and the life-force of everything.
It is also the gift of Wesir and Aset as the deities of harvesting the crops and the growing of food.
Feed your soul. Feed your Ka. Feed your body.
Eat with care.