Coke also contains phosphoric acid IIRC - I stuck a pH meter into a can
once for a giggle and stopped laughing because it came back with a reading of
just under 3. Citric acid is a higher pH value, yes, as is the carbonic
acid that also should be in there from the CO2 in the drink. Sure the
stomach is at lower pH and can secrete mucus to protect itself ...but if
you start throwing lots of highly acid stuff in there then any problems
you have with acid are just going to be made worse. If oyu are borderline
for anything that'll probably be able to kick you over.

This is all going to be be based on volume - ie how much of the stuff you
put down your throat.

Add to that the acid side of things is going to have a more profound
effect in the mouth and yes there probably is a fairly sound set of advice
to consider controlling our consumption of this sort of drink and that
excessive amounts can cause problems (a friend of mine had just this
happen, but he had a 4-5litre a day cola habit - which cutting back
helped).

Tim
--
When playing rugby, its not the winning that counts, but the taking apart
ICQ: 5178568

It can be harmful to your teeth, my dentist tells me, but no, not the
stomach.

HMc