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[–] xyzzy 0 points 3 points (+3|-0) ago 

Mutations are random, they don't serve a purpose. This one changes digestion a bit.

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[–] Microcosm [S] ago 

So is the mutation in the way the body digests or the way the nose works? Or both?

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[–] xyzzy 0 points 2 points (+2|-0) ago 

I'm no biochemist, but as far as I know it's in the digestive system. Some protein in aspargus gets broken down into something that smells. People without the mutation can smell it as well, so it's not the nose.