I chew it a lot as I find it takes the edge off any cravings!
However, I think it's meant to make you feel hungrier if anything - chewing food is the beginning of the digestive process, so it's gets all your systems running to prepare for food but then none comes...if that makes sense.
I know that, but nothing conclusive haha. I've been told it makes you hungrier though =)
As for the chewing more food, I think thats probably just because it gives you time to realise if you're full/still hungry. It takes a while for your brain to clock that you aren't actually hungry anymore, so if you're chucking it down, you'll have finished everything in sight before it can realise! Never works for me though!