If I have had breast cancer, is it risky to consume tamari sauce since it is soy-based?

This is a very common and important question. Concerns about soy and breast cancer stem largely from older, misinterpreted data, but more recent research has provided reassuring insights.

Current evidence suggests that moderate soy consumption is not associated with an increased risk of breast cancer. In fact, several studies have linked soy foods and isoflavones to a reduced risk of developing breast cancer, as well as improved outcomes in individuals who have already been treated. Some research has even shown a reduced risk of recurrence in certain populations.

Population-based studies, such as those conducted in Japan, have also observed that higher intake of soy foods like miso is associated with a lower incidence of breast cancer.

Since tamari is typically consumed in small amounts, it is not considered a risk in this context.

If you have a history of breast cancer, it’s always a good idea to confirm with your healthcare provider to ensure it aligns with your individual care plan.

References:
Kucuk, Omer. "Soy foods, isoflavones, and breast cancer." (2017): 1901-1903.
Ziaei, Samira, and Reginald Halaby. "Dietary isoflavones and breast cancer risk." Medicines 4.2 (2017): 18.
Yamamoto, Seiichiro, et al. "Soy, isoflavones, and breast cancer risk in Japan." Journal of the national cancer institute 95.12 (2003): 906-913.
Kang, Xinmei, et al. "Effect of soy isoflavones on breast cancer recurrence and death for patients receiving adjuvant endocrine therapy." Cmaj 182.17 (2010): 1857-1862.