Can soy-based foods reduce cancer risk?
Soy-derived foods are an excellent source of protein and a good alternative to meat. Soy contains several phytochemicals, some of which have weak estrogen activity and appear to protect against hormone-dependent cancers in animal studies. At this time there is little data showing that soy supplements can help reduce cancer risk. High doses of soy could possibly increase the risk of estrogen-responsive cancers, such as breast or endometrial cancer. Women with breast cancer should take in only moderate amounts of soy foods as part of a healthy, plant-based diet. They should not ingest very high levels of soy in their diet or take concentrated sources of soy such as soy-containing pills or powders, or supplements containing high amounts of isoflavones.
