Soy especially processed soy, like Soy Milk and protein bars made of soy isolate, soysauces, etc...causes Hormonal Imbalances. A little may not be enough to notice. However it mimics estrogen in the body which may inhibit ones production of other hormones. Many men claim that they have experienced some libido problems while ingesting soy on a regular basis. Just a warning it may be different for you.