I have also found my portion sizes shrinking. It took about 3 months before I realized I was not eating as much in a sitting. My body has decided what amount it wants to eat and I try to accomadate it. I do find I get hungry all at once. It doesn't sneak up on me any more. I"ll be standing there and boom! I'm fammished. It is good to be prepared for that whack in the head. It comes about eveery 4 - 5 hours.