[She nods slowly. She's trying to puzzle it out. Because she will help if she's at all able. ]

Ah'm gonna ask some pretty dumb questions here, but it's just so Ah can get an idea of what exactly is the cause.

[Also she's not a scientist nor a genius, so please bare with her.]

Ya said yer body doesn't produce a certain necessary chemical.... tryptophan? Is that in yer genetic structure, or is the production somehow suppressed? Ah mean do ya have the physical requirements t'produce it at all, but somehow can't?