> As for feeling hungry after the fish breakfast have you considered that it
> might be due to the very low satiety of fish? Fish has quite a high
insulin
> index compared to other sources of protein.

Insulin is supposed to inhibit hunger.  Insulin crosses the blood brain
barrier to interact with the hypothalamus to
prevent the synthesis of neuropeptide Y, probably the most potent stimulator
of appetite.

    Food               Glucose Score      Insulin Score
                                        %                        %
_________________________________________________
    Eggs                           42                     31
   Cheese                       55                     45
   Beef                            21                      51
   Lentils                         62                      58
   Fish                             28                      59
   Baked beans            114                   120


Rob