I would tell you to try to refrain from them. My doctor really didn't have a big problem with me having them but said if I did he would rather me drink a regular soda than a diet and that I probably wouldn't want them anyway. He said anything with asperatame is bad bad bad for anyone, he will not allow anything in his home with it. Suggested I only use Truvia or real sugar which would be empty calories. I don't know if he put some sort of spell on me when he said that because I use to drink Diet Dr. Pepper constantly, now I haven't had one since July 15th, the day before my pre op diet started. I did take a sip of one just the other day just to see and honestly it didn't even taste good anymore. Plus the carbonation can cause you some discomfort with the band so I say no to soda's!! Crystal Light now has CL pure which is made with truvia, I am stooked about it and I use it to drink Iced tea (In the South you have to have your iced tea!)