- Studies suggest a correlation between high consumption of soy foods like tofu before a lung cancer diagnosis and extended survival times in women.
- Lung cancer is the leading cause of cancer-related deaths among women globally, affecting a higher proportion of non-smokers in Asia compared to the U.S.
- The potential of tofu and other soy foods in extending survival rates may be attributed to the isoflavones found in soybeans, having similar effects to that of SERMS, such as the breast cancer medication, tamoxifen.
- The research raises questions about how the age of initial soy consumption influences its cancer-fighting properties and if certain types of soy foods are more effective than others.
- Despite uncertainties, some recommend the addition of soy foods to diets due to its nutritional benefits, calling for further studies to solidify these findings.
Emerging studies point to the potential life-extending properties of soy foods like tofu for women diagnosed with lung cancer.
A research paper in the field of clinical oncology suggests a correlation between high consumption of soy foods prior to a lung cancer diagnosis and extended survival times. This discovery is hailed as the first potential connection between soy food intake and survival rates in lung cancer sufferers.
The effect, however, wasn’t noticeable in women who consumed soy products in small quantities before their lung cancer diagnosis.
High Mortality Rates in Lung Cancer Cases
Lung cancer leads as the most common cause of cancer-related deaths among women globally. This deadly disease develops in the lung tissues, generally in the cells that form the airways. Compared to breast cancer, lung cancer has a significantly lower five-year survival rate.
Though cigarette smoking is identified as the top cause of lung cancer in the U.S., most of the women involved in this particular study from Shanghai, China, were non-smokers. Curiously, lung cancer appears to affect a larger proportion of non-smoking women in Asia compared to the U.S. The reason behind this disparity is still unclear, though some suggest the presence of lung growth-causing mutations.
The Role of Soy in the Diet
The data for this research came from the Shanghai Women’s Health Study, an expansive observational study tracking the incidence of cancer in approximately 75,000 women. Detailed diet records allowed researchers to track the consumption of various soy foods. This included soy milk, tofu, fresh and dried soybeans, and soy sprouts.
About 450 women received a lung cancer diagnosis over the course of the study. These participants were sorted into groups based on their pre-diagnosis soy intake. High intake levels averaged about 4 ounces of tofu daily, while the lowest soy consumers ingested less than 2 ounces daily.
Link Between Consumption and Survival Rates
During the study, over 300 lung cancer patients passed away. However, survival rates were higher among heavier soy consumers, with 60% of the highest soy-eating group and 50% of the low soy consumer group remaining alive twelve months post-diagnosis. Survival chances appeared to rise with increasing soy intake, but plateaued at a daily consumption level of around 4 ounces of tofu.
What in Soybeans Could Slow Cancer?
Soybeans carry isoflavones which can mimic the effects of selective estrogen modulators (SERMS), such as tamoxifen, a medication used in breast cancer treatment. These SERMS could potentially offer protection against lung cancer, given the presence of estrogen receptors in the development of the lungs.
Unanswered Questions and Future Research
Though promising, the study raises several questions: How does the age of initial soy consumption influence its possible cancer-fighting properties? Are certain types of soy foods more effective in combating the disease than others? Moreover, can these results be universally applied, or are they specific to the Chinese population?
Given that the study primarily focused on data collected pre-diagnosis, it may be valuable for future research to explore whether increasing soy intake post-diagnosis can similarly affect survival rates.
Soybeans are known for their many nutritional benefits, being a rich source of vegetable protein, fibre, and usually being fortified with calcium. Hence, despite current uncertainties, some recommend its addition to diets, though not to excess.
However, one consensus is clear: there is a need for further study to solidify or disprove these findings before any definitive dietary recommendations can be made.
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