My son's GF has been a vegetarian all her life. If she does eat something that's been cooked in the same oil as meat, she becomes ill. So it can be a physical problem as well as an ethical one. I know that she asks about that kind of stuff so that she can avoid any problems. I'd actually never thought about it until recently, but it's an interesting issue, and makes me wish we had a vegetarian restaurant where we live.
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