Aliya Summary: It is forbidden to follow the customs and practices of the nations amongst whom we find ourselves, and to be meticulous about eating only kosher foods. The Torah portion ends on the same note as it started — an enjoinder that we be holy (different/special/above our surroundings).
Notice the dual role that every Jew must play. We are each individuals and we are part of a people. We are exhorted to keep the Torah as individuals, but we are also “advised” to be faithful to G-d so that tragedies will not happen to the People as a whole.