YOM KIPPUR: THOSE NOT OBLIGATED TO FAST

The rabbis in Orthodox Judaism teach that if someone is suffering from medical condition or a potentially life-threatening illness then fasting on Yom Kippur is forbidden for this person. In Leviticus / Vayikra 18:5 it is written:

Leviticus 18:5 You shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them: I am the Lord.