Biotype O is a Tropical biotype. This type has inherited a tropical gene for blood type O from very ancient ancestors in southern India, Indonesia, Africa, or from the Amerindians in North, Central and South America. Their ancestors adapted to their specific ecosystems over long periods of time in isolation, and modern O's have inherited those adaptations. They fare best with tropical hunter-gatherer foods, such as meats, poultry, some seafood, yams, roots and tubers, nuts, beans, vegetables, leafy greens, coconuts and other tropical fruits and berries. Those descended from Amerindians also fare well with nightshades, which are native to the Americas.

The Biotype Research shows that blood type O has the highest rate of dairy allergies of all blood types, including both immediate and delayed allergies. The IgG graph at right is an example. This biotype also reacts to eggs and gluten grains, as shown at right. IgG scores of 1600 are mild, 2400 are moderate, and 3200 denote strong allergies. Blood type B also displays some immediate allergies (IgE), plus reactions to seafood lectins and T-cell allergens (milk). (Not shown.) For more on this biotype, see the Biotype Diets book.

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