We Jews are a people separated out for G-d’s use. This means we must treat our bodies in a G-dly manner.
We are not mutilate our bodies in any way, shape, or form.
We are to follow the instructions of Kashrut (permitted verse forbidden foods.)
“Moses then instructed the Jewish people regarding how they must distinguish themselves from other peoples in order to remain true to their Divine mission. These instructions included the laws regarding bodily mutilation and kashrut (i.e., permitted vs. forbidden types of food).
[Moses told the Jewish people,] “You are the children of G‑d.” Deuteronomy 14:1
In the words of Rabbi Yisrael Ba’al Shem Tov, the founder of Chasidism, “Every Jew is as precious to G‑d as an only son born to his parents in their old age is to them – and, in fact, even more precious.”
G‑d created the world for the sake of the Jewish people – meaning not only for the sake of the Jewish people as a whole but for the sake of each individual Jew. Therefore, we should all live our lives as if the entire world were created for each of us individually, and awaits our unique contributions to its destiny.1 Likutei Sichot, vol. 3, p. 982.