well, it would depend on what you consider urban myth from holostic/alternative healing/medicine. let me give you some background first. i am a firm believer in alternative treatments because now i know how the body works. the body is a self healing organ and every cell in it will be replaced every three years. this is how people with cancer, aids, and heart disease heal themselves. they eliminate the toxins and eat what the body was designed for along with detoxification and clenses, all extremly important if you want to heal yourself.(soda is most defintly a toxin, not just because of the caffiene, but cause of everything else in it too.)
any alternative website on medicine, and there are some excellent periodicals too such as prevention magazine which is put out by doctors, that can confirm these things as true.
anyway, with that in mind i went to the american cancer societys website. i fully support them in everyway. even though their research did say that they have yet to prove a relationship with cancer with moderate use, in a study of 64,000 heavy caffiene users their was a strong link. it also said that saccharin and its like sugars can cause bladder stones which in return can cause bladder cancer, thus showing indirect link.
the funding for research that the ACS gets is not enough to explore more indeptly on the correlation between caffeine and cancer.
i believe the monies not their for it because they have more pressing things to research in areas of cancer now and because big soda/big junk food industry is huge in the u.s. just like cigerettes i believe that the makers put and keep the caffeine in there to keep people addicted (i know i sure the hell am). theres been lots of studies done on this. the soda industry says that they add caffiene for the taste.but numerous studies have shown that only 2 in 25 people can even taste the caffiene in soda. here is a good link on it.:
http://www.applesforhealth.com/caffsoda2.html
its just a little brief but im sure you could yield more on the subject with a search.
in current events and politics there is a thread in which i have indeptly posted on how the usda was charged with setting up the food pryamids to favor the dairy and meat industry despite what the health officals wanted because they were largly backed by the dairy and cattlemens associations.this is partially why i dont trust anything that has to do with making money to have advice on my health (i.e. the govt) you can read all about it here:
http://www.bluelight.ru/cgi/ultimatebb.cgi?ubb=get_topic&f=40&t=000537
i also want to add that a search on "breast problems" will yield a lot of sources from university studies, doctors, and the homopathic world about caffiene and fiborus breast. it is not yet proved if the fibors could become cancerous, most have been found not to turn into anything more serious, but real turmors sometimes disquise themselves under these fibors (breast cyst) and go undetected. here is a site on that:
http://altmedicine.about.com/library/weekly/aa122900a.htm
as for stomach and pancreatic cancer, i think its more of a relationship with the carbonation and not the caffiene. it is important to keep your body alkeline. soda can cause your body to become imbalnced. here are some sites, including dr.weils who is very known in the field of medicine,ophra raves of him, and hes wrote several books over the years, that will explain how this works. the link for weils site has referenced soda to cardiovascular disease:
http://www.drweil.com/app/cda/drw_cda.html?command=healthConditionDetail&articleType=Condition&pt=Condition&articleId=21
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http://www.coralconnection.net/cci/soda.html
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this site is from years of research on soda:
http://www.talewins.com/Life/Trend.htm
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when we talk about the link between diabetes and soda you have to understand how insulin works in the body.theres not just a link between the sugar in soda, but also the caffiene.they say even three cups a day may be too much. here are some links about that although, some of the above may have also talked about it:
http://webmd.lycos.com/content/article/1667.52095
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http://www.health-doc.com/healtharticles/Diabetes-children.html
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i want to finish this by adding that i believe that homopathic medicine is much more advanced in trying to find cures then conventional medicine. though, i support use of both at the same time. my story in alternative medicine began when my husband who had psorasis on 90% of his body for 13 years had to stop taking his drugs because we were trying to get pregnant and our baby could be born with club feet or hands. he had to be off for 6 months before i could try to concieve.
for years the medical profession had led him to believe, and they still do to this day, that my husband had to take methotrexate (which is a drug for cancer patients on chemo), and undergo light treatment therapy. along with the methotrexate he took something else to control the itching. because of the methotrexate he had to have liver biopsies. my husband also had to take drugs to control the artheritis (sp) that comes along with his type of psorasis. we were spending over $200 a week on his puva(light) therapy and his drugs. to save money we bought the lights ourselves and made him a lightbox. the box required 12 perscription bulbs at $112 dollars each. oh, and then the light treatments were a catch 22 cause in the long run they cause skin cancer.
anyhow, one day by the grace of God we met some doctors (they really were real doctors of medicine), but they had opened up a healing center where people with terminal diseases go to be led into remission. they told my husband all about psorasis and why he had it and how he could get rid of it, and he took their advice and it worked with in two weeks he had no more. my husband has seen alot of doctors. in fact because of the severity of his psorasis he was a test case for the university of miami. every doctor of conventional medicine told him they dont know what causes it and there is no cure. only drugs to cover it up and hide it temporary while on the drugs. its been 7 years and we have two very healthy children, ones we may not of had had he continued on the meds he was on.