About 7 yrs ago I was drinking 2 two liter bottle of COKE per day instead of water. My triglycerde level was 1200 (normal is below 150) and the doctor laughed and said "Well, when you live on sugar, that happens.) I got on line and started researching how addictive COKE (soda) was and I cut down on it slowly. I hardly drink any at all, nor have I for the past six years. It is really just empty calories.
You can do it. Diet soda is really bad for us. I have flavored water (SPRING water) now with a little fruit juice.