Sa Japan ang may pinakamababang bilang ng mga babaing may breast cancer dahil sa pagkain ng soy. Ang soy ay staple food sa nasabing bansa. Gayunman, hindi gaanong maliwanag kung ang soy nga ang nagprotekta para hindi magka-cancer. If soy is protective, women may have to consume it early in life to gain the benefit.
In postmenopausal women, who no longer produce a lot of estrogen, high intake of soy estrogens might actually stimulate the growth of some breast tumors. Some women have developed goiter or symptoms of hypothyroidism, while consuming large amount of soy.
Kung kayo ay nagti-take ng thyroid hormone para mai-correct ang hypothyroidism, matutulungan kayo ng soy para maabsorb ito nang maayos. Ganoon man, ang soy ay isa sa mga pagkaing itinuturong responsable sa allergic reactions. Given the current evicence, we suggest that soy foods viewed as a good protein source to include in a healthy, balanced diet. Just keep in mind that soy is not a substitute for strategies known to lower cholesterol and reduce the risk for osteoporosis, such as diet, exercise and medication.