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I always wondered why he suddenly becomes allergic to citrus.

In one of his first appearances on SG1, he invites Carter to the cafeteria, mentioning that they have lemon chicken, with excitement. If I'm not mistaken, it's not until the SGA fork that he seems to be allergic to citrus.

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I think you're confusing episodes. In his first appearance he mentions that he's allergic to citrus. The "I love lemon chicken" incident comes from Carter's visit to a parallel universe when she's experimenting with the merlin device in a later season.

...I'm really embarrassed that I know that from memory.

He might've developed a sensitivity to it in the meantime; that sort of thing happens.

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