Plenty of studies show that the hormonal effects of phytoestrogen ingestion (e.g., lower levels of testosterone) could, in theory, result in infertility. What we lack so far is evidence that this is a real problem in clinical practice. Even so, some level of suspicion may be warranted in infertile patients.
Phytoestrogens are endocrine disruptors because they are chemicals that disrupt normal hormonal function. However, phytoestrogens do not bind to estrogen receptors as firmly as estrogen produced by the body, so their effects may be weaker .
Some scientists are concerned that a high intake of phytoestrogens may disrupt the body's hormonal balance. In fact, phytoestrogens are classified as endocrine disruptors. These are chemicals that may interfere with the body's hormonal system when consumed at a sufficiently high dose