I think “the war” refers to World War II (curious name for it!) and this person still has a point, unless you went to med school before 1990. The wiki[0] says t

I think “the war” refers to World War II (curious name for it!) and this person still has a point, unless you went to med school before 1990. The wiki[0] says that the effect was discovered in 1989, and lots of the referenced literature is from 2002/2003. [0] https://en.m.wikipedia.org/wiki/Grapefruit–drug_interactions https://en.m.wikipedia.org/wiki/Grapefruit–drug_interactions