(1) Since a healthy and whole body is necessary for the ways of G-D (for it is impossible to imply or know anything of Godly wisdom when one is sick), therefore one must distance himself from things that are damaging to the body and to accustom oneself to things that strengthen and make one healthy. They are as follows: a person should only eat when he is hungry, and drink when he is thirsty.
Notes from Rabbi Yochanan Twersky (the Tolner Rebbe)
“It was his custom to do cartwheels/flips at certain moments. He had a fixed time to do it every night, before all holy ritual acts like Kiddush, before lighting Chanukah candles and such, before reading a particularly difficult kvitel [letters of request for assistance from congregants], in order to gladden the bride and groom at a wedding. He would do this as a form of self-erasure (bitul ha-yesh) Sometimes he would explain himself in words of rebirth and renewal, a nullification of the past and open reception for the future.
1st Macabees 1:10-15
10 And there came out of them a wicked root Antiochus surnamed Epiphanes, son of Antiochus the king, who had been an hostage at Rome, and he reigned in the hundred and thirty and seventh year of the kingdom of the Greeks. 11In those days went there out of Israel wicked men, who persuaded many, saying, Let us go and make a covenant with the heathen that are round about us: for since we departed from them we have had much sorrow. 12So this device pleased them well. 13Then certain of the people were so forward herein, that they went to the king, who gave them licence to do after the ordinances of the heathen: 14Whereupon they built a place of exercise at Jerusalem according to the customs of the heathen: 15And made themselves uncircumcised, and forsook the holy covenant, and joined themselves to the heathen, and were sold to do mischief.
Jerusalem Talmud, Kiddushin
In the world to come, a person will be asked to give an account for that which, being excellent to eat, she gazed at and did not eat.