Random observation...
I also noticed my sweat smelled really bad, like a day in the saddle/long run/full game of footy or rugby or squash + then sitting in dirty kit for the rest of the evening bad - not through not showering or anything, but just generally bad (might be the already mentioned effects of sense of smell though).
It seems to be massively dehydrating me. I drink lots of water and usually piss pretty clear, but with this I've had much darker wee. My pits are also a bit smelly (which I also only get when dehydrated).
Random observation...
I also noticed my sweat smelled really bad, like a day in the saddle/long run/full game of footy or rugby or squash + then sitting in dirty kit for the rest of the evening bad - not through not showering or anything, but just generally bad (might be the already mentioned effects of sense of smell though).