I used to drink 4 mountain dews minimum a day....I had a major withdrawel from sugar and caffiene...I almost didn't stick with this woe...because of this...but I have made it through...I still have a little caffiene a day but no SUGAR....I still have the headaches but I think that is because I only eat like 10-15 carbs a day...I try to drink lots of water....I have just never been a water person..but I am trying....!