I was specifically thinking of anosmia and ageusia. There are many invisible disabilities that most people aren't aware of; anosmia is one of the ones where most people who don't have the issue don't even see why it might be a problem until they've really thought about it.

Couple of articles about or by people who have experienced the loss:

http://www.slate.com/articles/health_and_science/medical_exa...

http://www.smh.com.au/lifestyle/diet-and-fitness/life-withou...