" Asian women are up to five times less likely to develop breast cancer than North American women.146 Why? One possibility is their intake of green tea, a common staple in many Asian diets. Green tea has been associated with about a 30 percent reduction in breast cancer risk.147 Another strong possibility is a relatively high intake of soy, which, if consumed consistently during childhood, may cut the risk of breast cancer later in life by half. If women consume soy primarily as an adult, though, their risk reduction may only be closer to 25 percent.148 "

― Michael Greger , How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease