I have been reading about this lately and it seems to go hand in hand with a low carb lifestyle. The number assigned to these foods can help us to make better choices when choosing what we should and shouldn't be eating. Check out this site to get a better understanding of how food affects our blood sugar levels ultimately making us fat when choosing the wrong foods. I just found out that popcorn is worse than a snickers bar which makes me want to rethink that popcorn I was thinking about splurging on at the movies.