When reading food labels how can I find out the glycemic index of the product?

I am trying to lose weight and the successful celebrities that I admire that lost an impressive amount of weight said that they followed a low glycemic diet. I have been reading food labes since I started eating healthy but do not see a listing on nutritional information section of the food label for food items? Some food items like Luna Bars list this this product is low glycemic but not all lables list such information that I can see. Perhaps someone can tell me what to look for.
I am so sick of people not answering the question posted and instead trying to get my money for Acai Berry which does not work! I did not ask about Acai Berry! I asked a legitmate question about the Glycemic Index and deserve a legitimate answer!

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