3 facts on the role of soy in preventing cancer

Many studies have proven the health benefits of soy, but science is still inconclusive about the role soy could play in decreasing risks of cancer. Here's the lowdown on soy and the Big C.

Some common forms of cancer in Western countries are relatively rare throughout Asia. Many scientists believe that diet plays a role. Studies suggest elements of Asian cuisine, namely soy, could slow or prevent the dreaded diseases, especially against prostate cancer. A study by Chinese researchers showed that men who ate the most tofu (about 25 grams/one ounce or so daily, on average) cut their risk of prostate cancer by nearly half. A Japanese study came to a similar conclusion, though it found that men who ate natto (made from fermented soybeans) gained even greater protection. If tofu and natto are too exotic for your taste, try soy milk.

One study in California found  men who drank soy milk at least once a day reduced their risk of prostate cancer by 70 percent. A recent study found men at high risk for the disease who drank soy protein shakes for six months had prostates with fewer receptors for androgens, or male hormones, which fuel the growth of tumours on this gland.

Some doctors caution women at risk for breast cancer to avoid consuming large amounts of soy, since some studies suggest it may increase their risk. And a Japanese study found  while soy foods protected against localized prostate cancer, a hearty diet of tofu and other soy dishes may have increased the risk of advanced prostate cancer, which spreads to other organs.

More studies are still being done but early indications are that soy based foods are a great fighter in the war against cancer.