I am puzzled by this line in the Gemara, based on a baraita:
Olive oil [restores forgotten Torah study]... Rabbi Yoḥanan said: Just as eating an olive causes one to forget seventy years’ worth of Torah study, olive oil restores seventy years’ worth of Torah study. [Horayot 13b]
Where is this coming from? What is it based on? What does it mean? Was any halacha derived from it?
(I love olives!)