Sodas and Calcium

Switching to diet soda can cut calories from your diet, but even diet soda contains a lot of phosphoric acid, which can interfere with calcium absorption in the body, according to nutritionists at Brigham and Women's Hospital in Boston. A typical 12-ounce can of soda contains 44 to 62 mg of phosphoric acid; a 12-ounce diet soda contains 27 to 39 mg of the acid. Not all soda contains phosphoric acid, so check the label.