This is, in part, what gives them their kick. Phosphorous is a very active element, having the ability to combine with calcium.
Most people have a poor calcium intake.
The phosphorus then pulls the calcium from their storage warehouse - that is, their teeth and bones. The result is osteoporosis - that is, loss of density of bones, back and disc trouble, pyorrhea and, of course, decayed teeth. The sugar, three to six teaspoons full per six ounces of soft drink, of course, multiplies the problem.