There are specific considerations regarding foods that should be avoided for breast cancer patients. Foods, medications, or health supplements containing sex hormones are absolutely prohibited. The most common source of sex hormones in food is the use of placenta for nourishment, which is a common practice among the Chinese populace but is strictly forbidden in this case. Medications typically involve contraceptives, so it is crucial, especially in younger breast cancer patients, to consider non-medication-based contraception and avoid unplanned pregnancies — these are absolute taboos. Additionally, foods low in fats and cholesterol are not entirely prohibited but should be consumed in moderation.