Women differ in how much acai berry & colon cleanse they produce, in how they metabolize it, and in how many years of their lives their breast tissue is exposed to high levels of it. There are genetic influences here along with environmental ones. Early onset of menstruation and late onset of menopause both increase lifetime estrogen exposure, while having babies and breast-feeding both decrease it. The body metabolizes estrogen along two main enzymatic pathways. One leads to a metabolite that increases breast cancer risk, the other does not; it may even reduce risk. A woman’s genes may influence the preferred pathway but so do her dietary habits.