Talk about 'head hunger': 
I'm lucky, I guess, because the diet has been...well, not easy, but I just do it.  I can't say that I'm really struggling with it.  I think I just don't know what real hunger feels like.  I do think about eating of course, but try to force my thoughts in a different direction.  Fact, after I realized that I was seeing 5 ads in a row that were food related, I stopped watching TV entirely!! 
But last night (I'm day 8 pos-op BTW) I kept dreaming that I was eating...I mean really detailed dreams(?) of chewing (usually a tunafish sandwich ????) and then suddenly realizing I shouldn't be eating because of the surgery, and then spitting out the food!!  Veeerrry weird. 
And now day 8 dawns, it's yogurt day...and I couldn't care less!  I am looking forward to full liquids, but not with any real longing.  I thought I'd be ready to gnaw on the table by now.