Soy and soy protein are related but not the same. Soy refers to whole soybeans or soy-based products. Meanwhile, soy protein is an isolated protein extracted from soybeans.  Unfortunately, soy protein isolate is not as healthy as whole soy. Soy protein isolate is often used in processed foods and supplements. It has been shown to increase insulin-like growth factors linked to cancer growth.10 Always seek medical advice if you suspect soy sensitivity or experience adverse reactions after consuming soy products.