What are the connotations of "Al Teshaktzu Es Nafshoseichem"?
Rashi (in Yoma, 80b): It is a prohibition against abominating oneself by eating Sheratzim.
Moshav Zekenim (from Makos 17b): [Es] includes everything disgusting, e.g. to drink from bloodletters' Kelim, and Beitzim Muzaros (they are not from a male, but a hen sat on them many days); if they are repulsive to a person, he may not eat them. One who delays his bowels (and some say, or urinating) transgresses this.
Seeing as only Kohanim are subject to the Isur of Tum'ah (See 21:1), why does the Torah write "v'Lo Sitam'u bahem"?
Rashi (in Yoma, 80): "v'Lo Sitam'u bahem" is (not a prohibition against touching Sheratzim, but) against eating them.
What are the ramifications of "v'Nitmeisem Bam"?
Rashi: If someone is Metamei himself by eating Sheratzim in this world, Hashem will be Metamei him in the World to Come and in the Yeshivah Shel Ma'alah. 1
Yuma 39a: We read this like 'v'Nitamtem Bam' - Aveirah 2 blunts a person's heart. Mesilas Yesharim (Perek 11) - forbidden foods enter Tum'ah in a person's heart and Nefesh, and Hashem's Kedushah leaves and distances from him, and true knowledge, Ru'ach and intellect leave him.