But say, one goes to get McDonald's nuggets and lightly and secretly messes up with it (adds a bit of lime one day, vinegar another, etc.) before giving it to t

But say, one goes to get McDonald's nuggets and lightly and secretly messes up with it (adds a bit of lime one day, vinegar another, etc.) before giving it to the obsessed child. Wouldn't that remove the "always the same" aspect and thus decreasing the appeal of junk food over other foods? Also I'm sure cheese, avocado, a carrot, zucchini or pumpkin from the supermarket are going to taste extremely similar across the months unless they are hyper tasters (in that case they'd definitely notice a change in taste across nuggets).