The only secretion from the human body that I know to be kosher is human milk. I am curious to know which other bodily fluids are kosher.
For example, is it kosher to drink sweat or tears? What about mucus?
Assume that a person has only eaten pareve kosher food, and later vomits it out. Is this vomit kosher?
There's at least a dozen other related questions that come to mind, but I'll stop here to avoid being gratuitously gross. In general, which bodily fluids are kosher and which ones are not?