A: Recent research suggests that soy may aid in everything from easing the symptoms of menopause to preventing bone density loss and decreasing cholesterol levels.

Soybeans naturally contain substances called isoflavones, which are sometimes isolated and added to supplements and soy beverages. Isoflavones act in much the same way as estrogen, inhibiting and stimulating the growth of certain types of cells in our bodies. Evidence points to disease-fighting properties of isoflavones, but proceed cautiously. Much research is still necessary on these compounds, since some scientists worry that too many isoflavones can be more harmful than beneficial to your health.

As a general rule, if you are currently consuming soy or are interested in starting, select dietary sources of soy rather than supplements. Tofu and soy burgers are good sources of soy protein. Read the labels carefully on soy beverages, sports bars, and supplements to determine if the product contains additional soy isoflavones. If you are consuming soy to lower your cholesterol, look for products displaying the cholesterol-lowering claim. To display this claim on a product label, a food must be low in fat, saturated fat, and cholesterol and contain at least 6.5 grams of soy protein per serving. To benefit from the cholesterol-lowering effect of soy protein, you must consume at least 25 grams of soy protein in combination with a low fat and cholesterol diet everyday. Be sure to check with your doctor before adding more soy products to your diet.

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