Being diabetic, I tried some of the low carb bars.
Not only did their taste and texture leave much to be desired, I didnt see much difference in blood sugar levels.
Here, this is the best thing to turn your life around in terms of 'eating' (the absolute and complete way to eat), especially being diabetic (which runs in my family).
I have followed this since 1996, and it's the best thing that has happened to me.
here is the link:
http://www.zoneperfect.com/site/content/faq.asp#howdoiknow