Most likely, Miss B. Our bodies do adjust to things that they are exposed to on a regular basis. I have not eaten chicken or turkey or pork in so long now, that whenever I try to, it actually makes me sick. As in "you just rented your meal" sick. LOL
Likewise, I can't eat anything that's very heavy, food-wise. Our meals tend to be fairly light on fats and such (elk, bison, rabbit, etc, do not really have a lot of fat on them), and I don't use sugar in much of our diet, nor do I use a lot of salt... so we all have kind of a low tolerance to the amount of sugar, salt, and fats that are found in most "normal" American diets.
And we've been off of the poultry and pork for so long that even my city born-and-raised Bear gets nauseous if he tries to eat it now. Which annoys him, but it's just because that's what his body has gotten used to. Our bodies do adjust based on exposure.