While researchers attempt to pin down recommendations for soy, it's wise to follow a few principles. Soy in Foods .
Researchers appear comfortable with the amount of soy in foods.
Even two to three servings a day, many agree, is safe for healthy women. Women at high risk for breast cancer or who already have the disease shouldn't feel worried if they include soy products up to several times a week as part of a healthful, largely plant-based diet low in saturated fat. Upper Limits . Some scientists advise a daily limit of 100 milligrams a day of soy estrogens, called isoflavones, to stay on the safe side. Two or three servings a day will likely leave you well under this limit.