The reason why we Kosher food is so the we Jews can stay connected to G-d. When we (I) eat Kosher food, our souls are kept pure and clean. When we eat certain non-Kosher foods, these foods bring about a certain coarseness, a cruelty, a spiritual indifference, a lack of spiritual sensitivity and thus we(I) cannot not maintain the pure heart and the Holy Spirit that G-d put in us.
This is why eating Kosher food is so important.
We (I) become dead to the things of G-d.