If patients have been on Depo-Provera, their last shot will need to be at least one year prior to their enrollment in the study. Patients will need to be using either barrier contraception or permanent sterilization for contraception. Patients will be told to avoid dietary phytoestrogen consumption outside of the research project during the course of the study. Allergies to soy, chocolate, wheat, or nuts. History of breast or endometrial cancer.
Fibroids grow in response to estrogen.
The body makes its own estrogen. However, natural forms of estrogen, otherwise known as phytoestrogens, exist in soy-based products. These phytoestrogens have been found to compete with the body's own estrogen supply and can decrease the effect of the body's own estrogen on the growth of the breast and uterine tissue. Neither the participant nor the researchers will know which type of protein bar she is eating during the course of the study until the study is complete. The participant is expected to eat one protein bar a day and avoid any soy-containing products for the six months of the study.