During menopause, a woman's natural production of estrogen drops to a minimum. The sudden reduction of estrogen creates a number of health problems for postmenopausal women. Postmenopausal women have higher risks of heart disease, diabetes and obesity. They are also more vulnerable to depression, mood swings, insomnia and other psychological disorders. The phytoestrogen in soy is an effective estrogen replacement. Regular intake of soy is a great way to prevent and alleviate these postmenopausal syndromes.