Here is an interesting article that links soy and weight loss.
check it out:

http://tobeinfo.fdkansas.net/weightloss/lose-weight-with-soy.html

There are a number of foods that are considered “Thermogenic” in nature, meaning that they actually help you burn more calories by raising your metabolism slightly. I know that corn, peas and rice are thermogenic foods, but I’m not sure about soy.

Dave