A new study in the May 2011 issue of Indian Journal of Medical Research suggests that eating soybean oil may boost cancer risk compared to eating a type of butter called cow ghee, a type of butter used in South Asian cuisine.
Unfortunately, many Americans who are committed to healthy lifestyles have been hoodwinked and manipulated into believing that unfermented and processed soy products like soymilk, soy cheese, soy burgers and soy ice cream are good for them.
R. Rani and V. K. Kansal of National Dairy Research Institute in Haryana, India tested both soybean oil and cow ghee in female rats that were at higher risk of mammary cancer because they were exposed to carcinogen 1,12-dimethylbenz(a)anthracene (DMBA).
Two groups of rats were fed a diet either with 10% soybean oil or cow ghee for 44 weeks. At five weeks, rats received 39 mg per day of DMBA through oral intubation to induce cancer.
The researchers found among the two groups of rats receiving DMBA, the rats on soybean oil had more tumors, compared with those on cow ghee, 65.4% versus 26.6%. The tumor weight was also higher in soybean oil users than the cow ghee users, 6.18 grams versus 1.67 grams.
The tumor latency was 23 weeks for rats on soybean oil and 27 weeks for rats on cow ghee.
Also the researchers found carcinogenesis progressed more rapidly in rats on soybean oil than those on cow ghee.
Though often promoted as "healthful" with the phrase "no cholesterol," many brands of soy cheeses contain dangerous partially hydrogenated fats. The brands that taste the best often contain high levels. The main ingredient of Tofutti brand soy cheese, for example, is water, followed by partially hydrogenated soybean oil. The Citizens for Science in the Public Interest found that "each 2/3 ounce slice contains 2 grams of artery-clogging trans fats.
Soybean oil has high amounts of omega-6 fatty acids, which some researchers believe may promote growth of tumors. Patients who receive alternative cancer treatments may be required not to use soybean oil and corn oil because of their potential negative impact on the risk of cancer.