Is it okay?  I got the started package of 90 pills but read nothing on diet soda.  It does have caffeine and I read nothing about it either.

Hi Browneyedgirl,

There is no interaction between caffeine and Alli so you do not need to worry about that. Diet soda is allowed on your plan. I would recommend balancing out where you fluids come from. Try to stick with water and seltzer as the primary source, have coffee and tea as you like, and limit your diet soda and caloric beverages as much as possible. Good luck, Betty Kovacs, MS, RD