By Dr. Jean Harvey-Berino, Ph.D., R.D., Joyce Hendley, Rachel Johnson, Ph.D, M.P.H., R.D., "5 Rules of Thumb for Lowering the Glycemic Index ," The EatingWell Diet (2007)

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Don’t be refined.
Watch your intake of foods and products made with refined grains, such as white bread or white rice, crackers, potatoes and pasta, and choose unrefined (whole-grain) versions of these foods whenever possible. It’s getting a lot easier—just look at how many whole-grain pastas you can find these days. Try mixing them half and half with their refined counterparts at first, then gradually phase in more whole grains as you become used to them.