May you have the opportunity to test your experimental design as appears in your later post!
I was wondering why I could resume eating cayenne and tomato after several months on the O diet when I had given them up as too irritating before, it seemed that other foods (dairy and/or wheat) might have altered how I was metabolizing them, because merely leaving gaps in time between food challenges had not produced the same effect.
Looking for references on dairy and tomato interactions with intestinal absorption, there is one study which showed direct shifts in intestinal absorption following eating specific foods.
Hum Toxicol 1989 Nov;8(6):425-429
Influence of nutritional factors on 239Np and 233Pa retention in weanling rats.
Kargacin B, Volf V
Kernforschungszentrum Karlsruhe, Institut fur Genetik und Toxikologie von Spaltstoffen, Federal Republic Germany.