Mushrooms and Green Tea
The researchers found that the greater the mushroom consumption (both fresh and dried), the lower the breast-cancer risk. Those who ate the greatest amounts of fresh mushrooms (10 grams or more per day) were about 2/3 less likely than those who ate none at all to develop breast cancer. Subjects who ate 4 grams per day saw their breast-cancer risk fall by half.
Interestingly, the women decreased their risk even more if they also drank green tea daily. The breast-cancer risk of women who consumed both mushrooms and green tea was 11 percent, compared to 18 percent for women who didn´t consume either food. The study used green tea, which is a "younger" tea but which still has caffeine.