The issues with Coke are far broader than sugar/saccharine etc and caffeine, although that's probably enough to be getting on with.
One of the most insidious problems is the phosphate content which literally sucks the calcium out of you - which at a time when babies are doing the same is not a good idea. There is huge concern that a new generation of coke guzzling teenage girls are going to have the dowager humps /extreme end of osteoporosis on a big scale that we have seen disappear in the last 50 years with better nutrition.
So, if you're on a coke trip (a tame one anyway), as I am (I'm anti and I like drinking it!)... please make sure you keep up a really high calcium diet/supplementation, it really makes a difference.
I had first stage osteo. before I had DS and spent all my pg. madly increasing my intake, so it stayed the same level it was to start with. This time I'm drinking a little coke and not really supplementing, so I'll let you know the outcome of my recklessness!
BTW, if you're going to take a Ca tablet, do it separately from your pg. vitamins if you can.
J
PS and now for the science bit..
www3.interscience.wiley.com/journal/118500501/abstract?CRETRY=1&SRETRY=0
www.ajcn.org/cgi/content/full/84/4/936
www.springerlink.com/content/h72ntw40g1447171/
www.medscape.com/viewarticle/463097
There's a ton more, but I need to go to bed.