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ancestors of the A2 people who predominately inhabit the Laplands of Scandanavia most likely subsisted on an Arctic diet that consisted of reindeer/caribou, lamb, goats, and oily fish. These are the protein foods that the A2 inhabitants were accustomed to eating much like the early O's were accustomed to a H/G diet. The A2's just happen to have fewer A antigens than A1 people. They also have fewer A antigens than type B's have B antigens, but this does not necessarily mean that an A2 requires more protein than a type B.

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A2's apparently could do with more meat, basically, and fewer refined grains.  The fish and poultry that the basic secretor A diet allows are good sources but de-emphasized on the classic A diet--you would want to eat more of them and some allowable red meats occasionally, if you are indeed an A2.