The active ingredient of Coca-Cola is orthophosphoric acid. Due to its high acidity, cisterns used for transporting of the concentrate have to be equipped with special reservoirs designed for highly corrosive materials...Medical professionals have been warning us about the effects of Coca Cola and soft drink consumption for years. That doesn’t seem to sway people from their sugary habit though. With a nation headed face first into obesity, it’s scary to see what the effects Coca Cola is having on our bodies. These are 10 things that happen to your body when you drink Coca Cola.