I dunno.  Maybe mostly.  It worked for a SIL, however.  She dropped 70, and has kept it off for 5 years.    She said it was easier for her to figure points, than estimate calories.  Not making excuses, but it worked for her, her eating preferences (fruit for chips, etc) changed, and she exercises every day.    If it works, ok.  But if not, then move to something else.