Soy protein contains less sulfuric amino acids and phosphorus than animal proteins. Large amounts of sulfur and phosphorus can cause the body to lose calcium, one of the most important minerals in retaining health bones. Isoflavone in soy may inhibit bone loss and stimulate bone formation. This may reduce the risk for osteoporosis, the bone-thinning process so common in postmenopausal women. Isoflavone in soy foods may relieve symptoms of menopause including vaginal dryness and the inability to regulate body temperature, which often leads to sweats and hot flashes.
Hot flashes occur in a significant number of pre- and perimenopausal women.
There are no well-controlled studies documenting the safety or appropriate dosage of soy in the prevention or treatment of these health issues. Many scientists and physicians are concerned about the lack of scientific evidence regarding how little soy, for example, may be necessary to reduce hot flash symptoms but not present a risk for breast or endometrial cancer. Since we are unsure how much soy is needed to provide a beneficial response without a potentially harmful response, no specific dosage can be safely recommended. Remember, just because a product is sold at a grocery or health food store, doesn't mean that the product is safe. The Diabetes Institutes Foundation.