The purpose of this study is to understand whether consuming flaxseed for approximately 50 days may beneficially affect the level of certain hormones in the blood thought to be involved in the development of breast cancer. This study will address the first steps toward the development of possible breast cancer prevention strategies. Differences in hormone levels (from blood samples) will be compared between two groups of women - those in the group assigned to eating ground flaxseed daily and those in the control group (with no change in diet).