Soy contains a plant estrogen and in the past there have been concerns that that plant estrogen main function, like the estrogen that we produce, if it's ingested. The good news is we don't see any risk of estrogen activity from those plant estrogen, when consumed in whole soy foods. In fact, some research shows that there was lower cancer risk and groups, who eat soy as part of their regular diet.
Whole soy Foods include things like edamame or soybeans, tofu, or tempeh, which are fermented soy products and these are great options for protein and that plant fiber along with vitamins and minerals.
If you'd like to incorporate soy, you are certainly safe to do so with these whole soy foods.