In reading Leviticus 11 we can clearly see that not only does God desire for us to be close to Him, He wants us to remain pure and holy. Thus, His instructions are given to keep and protect us from harming ourselves with the things we eat. May God help us carefully choose not just the things we eat, but the things we see, hear and do daily so they are all pleasing to Him.
Please, if you can read all of Leviticus 11.