Be sure that bottomless fizzy drinks will inevitably lead to digestion problems if you have such with a meal. A recent visit to Burger King convinced me of this. I don’t think it is (or was) the burgers which cause the problem, but the fact that you are congealing all the fat with ice-cold drinks. And the inevitable consequences ensue.
In contrast, if you have a hot drink with meal digestion is enhanced. Hence, it is interesting how the Chinese have Chinese tea with their meals to make digestion easier.
Here is a piece you may find to be of interest.