A can of soda can contain tablespoons of sugar. This is an issue and could give rise to osteoporosis. Diet sodas contain aspartame. Most sodas contain caffeine which has been linked to certain cancers. The water used in soda is not filtered and may contain chlorine and heavy metals. Harvard scientists have clearly established a link between drinking soda and being too fat. Sodas contain a lot of fructose and corn syrup that have been scientifically modified and may contain mercury. Soda does not contain any nutrients. It's good for you, but only harmful. Drinking soda dehydrates or dries out your body. Soda can cause an increase in plaque on your teeth.