<<If you read any of Sears' Zone writings, he says that adding protein to
every
meal stimulates glucagon, which is antagonistic to insulin (simplistic
paraphrase).>>

Influence of food on insulin and glucagon (p37, Protein Power)

Type of food                Insulin          Glucagon
carb                                5+                   0+
protein                           2+                    2+
fat                              no change     no change
carb + fat                        4+             no change
protein + fat                    2+                    2+
high protein/low carb     2+                    1+
high carb/low protein     9+                    1+

Rob