A can of soda may contain spoonfuls of sugar. The stakes could cause osteoporosis. Diet sodas contain aspartame. Most sodas contain caffeine, which has been linked to some cancers. The water used in drinks is not filtered and may contain chlorine and heavy metals. Harvard scientists have definitely linked drinking soda to being excessively fat. Sodas contain high fructose and corn syrup that has been scientifically modified and may contain mercury. Soda contains no nutrients. It's good for you, it's just harmful. Drinking soda dehydrates or dries out the body. Soda can cause your teeth to have more plaque.