I totally agree with Anarie and wouldn't worry about it. If you find a certain foods affects you negatively, avoid it or at least use caution when consuming it. It's really as simple as that.
The problem with the whole glycemic index thing is that it doesn't compare apples to apples....and it doesn't translate well to the way people actually eat.
Here's how they come up with the glycemic index of foods- www.glycemicindex.com/about.php
And there's things about the results that just don't make sense...at least to me.
For example, carrots-- www.glycemicindex.com/foodSearch.php
So I'm ok if I eat them raw (16) but if I eat them raw and diced (35) I may as well eat the boiled (33) as long as I don't cut them before boiling them (49) because then I'd be better off eating carrot cake (36-39). Really?! And if cutting makes such a difference why doesn't chewing?
Personally I consider the whole glycemic index thing to be pretty useless....unless I'm looking for a way to justify carrot cake lol. :)