It is stated that one who frequently eats olives will forget his learning (Horios 13). Would this also apply to an olive dip?
Answer:
It is common practice to add olive oil, which the Talmud states promotes one’s memory for Torah learning, to olives, thereby “offsetting” the effect of the olives. Some write that a significant amount of oil is required (rather than just a single drop). Thus, if the olive dip has olive oil in it, then there is no concern.
Furthremore, some write that the concern does not apply to pickled or cooked olives, so that there is further room to be lenient if the olives are treated.
Additionally, if the olives are not perceptible, some are entirely lenient.
Finally, it should be noted that eating olives (regularly) is not a full “prohibition” — Torah or rabbinic — but rather written by way of advice.
Sources: See Yabia Omer 2:8; Kol Torah, Sivan 5763, p. 25; Halichos Olam vol. 7, p. 217.
