Yes they have, yedida.
Scientifically, eating unclean foods or touching the dead are harmful to our health. Why? Because it brings germs and bacteria that may cause sickness. (And I personally view any sickness or illness as negative consequences of people's action)
You probably, disagrees with this because you view that the Torah isn't a guidebook to medical and health issues. Nevertheless, it is a known fact that the Israel has been saved from various diseases by eating kosher food. Pork has parasitic worms that caused trichinosis while seafoods without scales have more lead and mercury content which is very poisonous to humans.
Yeah, and at the same time, eating unclean foods or touching unclean items not only makes our body (externally and internally) filthy, but also serves to cause us to be disobedient to God! And I think all kinds of disobedience to him are called sins and that makes you spiritually unclean.
But for those women who were in there nidda (menstruation period) or for those people accidentally eat or touch unclean things it only makes them physically and ritualistically unclean. Ritualistically because they are expected to do a ritual or certain ceremony first before they'll be cleanse. One of the ritual is immersing in a mikveh (ritual) to become ritually clean.
Uncleanness denotes:
- Physical or Ritually, Mat 23:27
- Spiritual or Moral, Rom 1:24; 6:19; 2Cr 12:21; Gal 5:19; Eph 4:19; 5:3; Col 3:5; 1Th 2:3
And also, Gal 5:19-21 says:
And it is perfectly evident what the old nature does. It expresses itself in sexual immorality, uncleanliness and indecency; involvement with the occult and with drugs; in feuding, fighting, becoming jealous and getting angry; in selfish ambition, factionalism, intrigue and envy; in drunkenness, orgies and things like these. I warn you now as I have warned you before: those who do such things will have no share in the Kingdom of God!
And I believe the uncleanliness there could be anything from a dirty house, to unhygienic characteristic, to moral depravity.