Original sentence: There is some speculation that diets high in soy, due to high isoflavone content, can promote earlier onset of female puberty and delayed male puberty
Edited sentence: Proponents of this theory claim that diets high in isoflavones promote earlier onset of female puberty and delayed male puberty.There is some speculation that diets high in soy, due to high isoflavone content, can have a feminising effect on humans due to their action as phytoestrogens