I did not do 3 days of apples until 7 months after I started NSD. There are no rules to this.
I also never reacted to apples, never tested them. I may be less sensitive than others though.
I do think there are great benefits to the 3 days of apples with olive oil... but everyone may not want to do it, it is a difficult undertaking. I have done it about 15 times... but not in past 4 years... only occasional 1 days of apples. Life has gotten to busy with near 4 year old.
AS may win some battles, but I will win the war.
KONK - Keep ON Kicking