On "Gilmore Girls", what food is Dean allergic to?

On Gilmore Girls, Dean Forester is said to be allergic to walnuts. Lane Kim tells Rory about Dean’s allergy while sharing personal details she gathered about Rory’s new crush in the season-one episode “Kiss and Tell.”

Lane describes the allergy as “deathly,” and Rory immediately treats the information as important, replying, “Walnuts bad; got it.” The exchange is part of the show’s early portrait of Rory and Dean’s relationship, when Rory is learning small details about him through Lane’s enthusiastic research.

The walnut detail is a memorable example of Gilmore Girls using fast, conversational exposition. Rather than introducing Dean through a formal biography, the show reveals his background through gossip, observations, and the highly specific facts that circulate among Stars Hollow teenagers.

Some viewers remember the line because later scenes involving food and baked goods make the allergy seem easy to overlook. The question refers to the specific allergy stated in the series: walnuts, not nuts generally and not peanuts.