coca cola has phosphoric acid that eats away your magnesium and calcium. The consequences are: loss of bone mass (ostheoporosis, when your bones get crushed at the smallest blow), loss of enamel and ultimately loss of teeth. Reduction of sperm count is another consequence.
The same acid makes the stomach much more acid, increasing the chances for stomach and esophagus cancer.
If you take the normal one, it means cups of sugar every day, which brings problems with sleeping, anxiety, mood disorders, personality and mental disorders (they did experiments in hospital taking away sugar from mental patients, half of them, even serious ones, healed perfectly in a matter of months), impotence,
It you take the diet one, it contains high doses of acesulphame, that is famously related to cancer and sometimes sudden death,
together with autoimmune diseases and disorders of the central nervous system.
It contains many addictives, the numbers at the end like E150, to give it the brown color, and that also is directly related to cancer.
If you take a blood test and they tell you that you are low in calcium and magnesium, or vitamin D, it's a sign that something bad is going to happen soon, and that all thanks to coca cola. I know this because I was also addicted, and sometimes I still fall into the trap again, it's like smoking, only worse. Honestly, nicotine is healthier.
PS: sorry to ruin the party for everybody!