HollyRF makes a good point.

Food/drink/drugs/cigs/ whatever....they had a function in our lives...they were:

something to do
A buddy
A tranqualizer
A way to cope

And more

And now that they're gone....filling that void has been weird (at least for me) I found that A LOT of my life centered around the taste of food and food activities...none of which involved being hungry!

So yes...find something you can get passionate about and use that to fill the time...