A reader wanted to know of any health risks associated with soya and phytoestrogens. It's a subject we've covered before, but it's worth a revisit. One reader has heard that the fermented forms of soy, such as miso, natto and tempeh, are the most beneficial for health. They are the types that have been eaten in the East for centuries, and with good effects. Another reader goes further, claiming that modern soy products contain anti-nutrients and toxins that interfere with the absorption of vitamins and minerals. As most women are already suffering an estrogen overload, soya and phytoestrogens can exacerbate any tendency to estrogen-related cancers. They can also affect the thyroid, and the immune and hormonal systems.