Soy Protein and Bone Health in Women
Soy, a protein-rich legume, has been prominently featured in the traditional cuisines of Far Eastern cultures for thousands of years. In addition to its high protein content, soy also contains the other two macronutrients, carbohydrates and fats, as well as many vitamins, minerals and other micronutrients such as calcium, folic acid, and iron. Dietary sources of soy protein include soybeans, tofu, beans curd, tempeh, miso, and soymilk. Since it represents a vegetable source of high quality complete protein, containing all of the essential amino acids, soy is particularly valued by vegetarians, who must derive all their dietary protein from vegetables rather than from animal products.(DGPL)
Soy has yet to become as integrated into American cuisine as it has always been in the Far East, but its sales have gradually increased over the last ten years, to approximately $3 billion and almost one third of Americans consume soy in one form or another at least once a week. A cholesterol-free, high protein, high fiber, complex carbohydrate-rich food source that is low in saturated fat and sodium, soy is such a healthful food that researchers have theorized that it may be one explanation for the comparative lower incidence of certain medical problems in the Orient.(Rubin)
Numerous ongoing studies are endeavoring to determine the beneficial value of soy protein on such varied medical conditions as heart disease, cancer, and on various symptoms associated with menopause. Researchers have expressed particularly strong interest in the possibility that soy protein may reduce post- menopausal calcium loss in bones and concurrent estrogen deficiency-related reduction of bone density in women. So far, the results are somewhat positive, but ultimately inconclusive, in light of several recent studies.
Possible Bone Health Benefits:
Osteoporosis is an age-related loss of bone density that affects as many as 24 million Americans of both genders, but the highest incidence is among post- menopausal women. Anecdotal evidence of the relatively low incidence of osteoporosis in Asian cultures inspired medical researchers to examine the possible role of soy protein in the diets of comparatively healthy populations in China and Japan, where soy has...
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