I have a question that hopefully someone might be able to answer. I
have a female tabby about 2 years old, that has in the last month
developed a need to lick my hands every time she sits on my lap.  
She gets a little obsessed with it at times, and while it's not a
great inconvenience, I'm wondering if it signifies a dietary
deficiency of some sort.
I've heard that dogs will do this if they're lacking in salt, but her
diet has not changed, she eats the same food daily.
My male cat doesn't do this, so I'm a little perplexed. Any ideas
would be welcome.
Thanks