I've *heard* that the PH in soda is around 2.5 and the human body has been known to react by pulling out nutrients from your bones.

In fact, here it is:

"The active ingredient in most soda pop is phosphoric acid. The pH of most soda pop is 2.8, which is very acidic. As we discuss in detail in the body PH page, you want your diet to ALKALIZE your body, and ingesting a highly acidic drink like soda pop does the opposite and is very detrimental to your health. Phosphoric acid also leaches calcium from bones and is a major contributor to the rising increase in osteoporosis.
soda pop and osteoporosis

Animal studies show that phosphoric acid, a common ingredient in soda pop, can deplete bones of calcium."

http://www.healingdaily.com/detoxifi...t/soda-pop.htm