My sister rocks

Did you ever wonder where Answer Girl turns when she doesn't know the answer? Her older sister, of course.

The "psychological mechanism behind the refusal to eat something that once upon a time made you barf" (see my post on such query) is called the Garcia Effect.

Studying, what else?, rats, Dr. Garcia discovered that the rats would associate unpleasant experiences with taste and would avoid that taste in the future to avoid the experience. It's thought to be a survival mechanism, which I suppose makes sense. Get ptomaine poisoning from peanut butter and survive—never eat peanut butter again. Good plan. Still doesn't quite explain why I continue to eat hamburgers.

So now I know, ergo you know. Thanks, sis, you rock!