You may be confused by the conflicting information about the effects of soy on women. Soy is a good source of protein, and research is ongoing about the effects of soy on a variety of health conditions including menopause, osteoporosis and blood pressure. Overall, soy has been shown to be safe for most women. However, certain women may notice side effects from soy and soy supplements. Consult a physician before making any dietary changes or taking supplements.
Forms of Soy
Soy comes from the soybean and can be ingested in many forms. As a food, soybeans are eaten whole; they can be converted to tofu, soy milk, yogurt, cheese, butters, tempeh and oil; or they may be included in meat substitutes and protein powders. Soybean-based foods -- such as whole soybeans, soy milk and tofu -- contain the highest amounts of protein and isoflavones. Isoflavones are soy compounds considered to have health benefits. Many soy supplements are sold in pill or powder form that contain soy derivatives touted for health benefits.
Allergies
Women with soy allergies should avoid foods containing soy or any soy derivative such as soy isoflavones. Allergic reactions may include difficulty breathing or a rash. Read labels carefully, as many packaged foods contain soy or are produced in plants where they may come into contact with soy.
Breast Cancer Effects
Women with breast cancer or an increased risk of estrogen-related cancers such as breast, ovarian and cervical cancers, should consult with their doctors before consuming high amounts of soy or taking soy supplements. Research suggests soy may prevent breast cancer, yet it is unclear about the effects of soy and breast and other estrogen-related cancer progression. Soy and its derivatives may interact with the medication for breast cancer known as tamoxifen, or Nolvadex, making it less potent.
Effects on Other Conditions
People with kidney disease and hypothyroidism should consult a physician, as soy components may interact with the body to exacerbate these problems. Some women may experience digestive discomfort, including nausea, constipation or diarrhea, when consuming soy.
Drug Interactions
In addition to soy possibly reducing the effect of tamoxifen for breast cancer, it may also reduce the effectiveness of raloxifene, or Evista, for osteoporosis. Conversely, if you are taking supplements or increasing the amount of soy in your diet, zinc and iron can decrease the amounts of soy absorbed by the body.
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