A friend of mine has an infant that is allergic to cow's milk. This is common and, who cares, since the infant is being breast fed. EXCEPT for the fact that the infant is allergic to the dairy products that the mother is consuming. This is somewhat uncommon but certainly not unheard of. My interpretation of this is that a protein antigen not only passes relatively intact from the GI tract of the mother into her blood, but is then incorporated into her breast milk without being completely broken down to amino acids and/or incorporated into human milk proteins. I always thought that proteins were almost completely broken down into, at most, a few amino acids long before absorption. The previous link suggests that relatively intact dietary protein is present in our blood.
Does this lend credibility to those who fear the biological activity from ingested proteins that are introduced into our food artificially as in the case of bovine growth hormone in cow's milk or Bt toxin in GE crops?
Anybody with some helpful information?