The entire lining of the gut is covered by a protective film called mucin. It's made up of protein molecules, and these molecules vary by blood type. Bacteria and viruses can stick to this mucus layer- including the "good germs" that help our digestion work more efficiently. Another kind of protein in the mucin layer is a type of antibody called IgA. Both low and high levels of IgA are associated with different kinds of diseases. Lectins in food can affect the amount of IgA in the gut.
The Blood Type Diet is low in harmful lectins.
This helps keep IgA levels in a healthy range.
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