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Often times a kezayis or beitza is the amount of food necessary to transgress a food related prohibition. Why is a date specifically the quantity one must eat to be liable on Yom Kippur?

Shulchan Aruch (612:1) - האוכל ביום הכפורים ככותב' הגסה חייב והוא פחו' מכביצה מעט ושיעור זה שוה לכל אדם בין לננס בין לעוג מלך הבשן - One who eats on Yom Kippur (an amount) like a large date is obligated (for punishment having transgressed the Torah prohibition) and it is little less that egg-size. This measurement is equal to all people where Nanas (who was small) or Og, the King of Bashan (who was a giant).

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    I heard that a date size settles the mind. – Russell Jun 15 '20 at 19:49
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    @Russell The Gemara says precisely that in Yoma 79a and 80b. – Meir Jun 15 '20 at 20:49
  • @Meir Thank you for the source. – Russell Jun 15 '20 at 21:36
  • (ננס is from the Greek (νάνος) for dwarf. I don't think there is a historical figure by the name.) – Loewian Jun 16 '20 at 14:58

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