These drinks are also acidic and will bathe the lining of the oesophagus as they are swallowed.
The ex-Smiths frontman has suffered a number of illnesses including a bleeding ulcer, Barrett's oesophagus and double pneumonia.
Harrington's father Paddy was diagnosed with inoperable cancer of the oesophagus in March.
As his tongue continued to grow, his oesophagus began to constrict, so he felt he was about to suffocate.
Christopher Hitchens has continued his outspoken attacks on religion in interviews as he is treated for cancer of the oesophagus.
In that condition, the cells which line the oesophagus or stomach change their character and start to look like intestinal cells.
In tests on normal oesophagus and stomach tissue, GCC was not present.
However, research suggests that carbonated drinks cause the stomach to distend, which makes it more likely that its contents will flow back into the oesophagus.
"The images produced have been some of the best we have seen of the oesophagus, " says Prof Tearne, a professor of pathology at Harvard Medical School.
Because the stomach contents tend to be acidic, they irritate the lining of the oesophagus - a phenomenon which has been linked to the development of cancer.
Because the Jefferson team knew GCC was expressed in normal intestinal cells, they decided to examine if it was expressed in the oesophagus or stomach in patients with intestinal metaplasia.
Testing the equipment in six patients known to have Barrett's oesophagus and seven healthy volunteers, the researchers said the images clearly showed the cellular changes that occur in those with the condition.
In recent months the animal rights activist, who made his return to the stage last month at a show at the Staples Center in Los Angeles, has also suffered from a throat condition, Barrett's oesophagus, and anaemia.
When the patient swallows the capsule it is carried down the oesophagus in the same way any piece of food would be then once it reaches the stomach it can be pulled back out using the wire.
In recent months the animal rights activist, who made his return to the stage last month at a meat free show at the Staples Center in Los Angeles, has also suffered from throat condition, Barrett's oesophagus, and anaemia.
Patient Mavis Skeet, 74, was to have had surgery for cancer of the oesophagus, but it has been cancelled four times - three times because beds were taken by patients with flu, and once because her anaesthetist went down with the illness.
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