It's possible and if you are on antibiotics then you should really be on a with food programme anyway.
The chicken and lettuce should be fine though...
Don't take this the wrong way but are you sure it is physical hunger and not psychological hunger (not that that isn't bad!)
I do remember the first time I had a Cambridge bar after coming over from Lighterlife thinking I was hungry afterwards but I was still in ketosis but the mind can play some really good tricks on you!
Anyway I personally think 790 is a great way to lose weight without the baggage of SS so if you are off the pills this week then I would just make sure you stick to page 7/8 in the book and see if the hunger goes.
May be worth swopping to maybe monkfish or white fish for a few days with some cabbage just to see if the feelings are the same.
M.