Flaxseed and Fish Oils Flaxseed and fish oils both contain omega-3 fatty acids, substances associated with reduction of heart disease risk. Some preclinical studies suggest that omega-3 fatty acids reduce tumor growth and metastasis, but others show an increase in such effects. At the present time, therefore, evidence is insufficient to recommend dietary supplementation with either flaxseed oil or fish oils to reduce the risk of cancer recurrence or to improve prognosis.139-141 Ginger Although ginger does have antinausea properties and is useful in the management of motion sickness, it may not be an effective antiemetic agent during chemotherapy. This is because its activity is due to a local effect in the stomach rather than on the central nervous system. Nausea induced by chemotherapy often requires specific prescription medications that can block and prevent the stimulation of the emetic response at the level of the central nervous system. The taste and aroma of ginger and ginger-containing foods and beverages may be calming for some individuals, but large doses of ginger in pill form have been shown to cause depression and cardiac arrhythmias.142-144 Soy Foods While there is tremendous public and scientific enthusiasm for the use of soy foods in the prevention of recurrences of breast and prostate cancers, scientific support for such recommendations is remarkably inconsistent. Interest in soy foods stems from the observation that they are used commonly in Asia, where the rates of breast and prostate cancer are lower than in the US. Soy contains high levels of plant isoflavones (genistein and diadzein), which exert a variety of anticancer activities in laboratory studies. Some of these isoflavone compounds can act like “estrogens” or “anti-estrogens” in the body. Perhaps because soy has the potential for producing both types of effects, studies on soy and breast cancer have produced conflicting results, with some showing genistein to inhibit the growth of breast cells and others showing stimulatory effects. Several trials are examining the effects of soy components on cancer risk. Until these trials are concluded, there is insufficient information to make a recommendation about use of soy foods for cancer survivors. These products may have beneficial effects for some, and adverse effects for others.145-155 Teas Some evidence suggests that tea consumption, including both green and black teas, could reduce the risk of cancer. Epidemiologic evidence suggests that cancer risk might be lower among those who drink teas, especially green teas, which contain high levels of polyphenols, a family of antioxidant phytochemicals. Whether this is a specific effect of teas per se or other dietary or behavioral factors common among tea drinkers is not yet established. Although tea polyphenols can affect the growth of cancer cells in vitro, very little research has been done on the specific effects of tea consumption among cancer survivors. Preliminary laboratory studies looking at green tea intake and breast cancer growth have been performed, and studies on prostate cancer growth are planned or in progress.17-165 Except for its mild stimulant activity, which may cause problems among people prone to cardiac arrythmias, insomnia, or anxiety, moderate amounts of green or black teas can be considered safe. These teas, however, should not be confused with teas made from plants not ordinarily used for foods or beverages. The latter are often promoted as alternative therapies, and some are associated with significant toxicities. Remember we are NOT Doctors and have NO medical training. This site is like an Encylopedia - there are many pages, many links on many topics. Support our work with any size DONATION - see left side of any page - for how to donate. You can help raise awareness of CAM.