Biotype A1 is the European biotype. This type has inherited a European gene for blood type A1 from ancient ancestors in northern Europe. Their ancestors adapted to their specific ecosystem over long periods of time in isolation, and modern A1's have inherited those adaptations. They fare best with European foods, such as: poultry, some seafood, meats, most grains, some nuts, some dairy products (for females), and European fruits and vegetables.

The Biotype Research shows that type A1's are less reactive than type A2's in general, and have less allergies to grains. Type A1 particularly reacts to nuts, beans, seeds, nightshades, and some seafood. Blood type A1 displays some immediate IgE allergies, but mostly delayed allergies: IgG, lectins and T-cell allergies. The IgG graphs at right are examples. Also see Type A2 for an A1/A2 comparison by IgG. For more on this biotype, see the Biotype Diets book.

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