Liza offered an explanation for Mary's allergic reaction to fruit:
| There are so many factors to consider, when you get itchy, that it can
| sometimes be hard to single out any one single thing and "blame" it on
| that. It would be nice if things could be that simple, but in reality,
| they're usually not, especially when it comes to human physiology.

| Just to illustrate what I mean, here are a very few of the multitude of
| possible causes of your itching and hives:

[snip]

| I've used the example of a person standing on one tippy-toe. Standing
| this way, very precariously balanced, they could easily be knocked over
| by gently nudging them with a spoon. You could erroneously draw the
| conclusion that this person was wildly "allergic" to spoons. In other
| words, there are so many other things going on in the body that may be
| "out of balance," and because they are all so interrelated and dependent
| upon each other, it usually takes a bit of detective work and patience
| to figure out what is really going on.

| Not trying to make life more difficult, just trying to help you to
| avoid  jumpimg to possibly overly simplistic, and maybe even erroneous,
| conclusions about your body's signals.

Jo sez:
This is about as sensible as it gets. Thanks, Liza, for your clarity.