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SOY

Here's a research poster on soy milk.

[Soy lowers blood pressure] Gong Yang et al,  Longitudinal study of soy food intake and blood pressure among middle-aged and elderly Chinese women Am J Clin Nutr 2005 81: 1012-1017

Objective: Our aim was to examine the association between usualintake of soy foods and BP. Design: The usual intake of soy foods was assessed at baseline,and BP was measured 2–3 y after the baseline survey among45 694 participants of the Shanghai Women's Health Study aged40–70 y… Conclusion: Usual intake of soy foods was inversely associatedwith both systolic and diastolic BPs, particularly among elderlywomen.

SOY LOWERS LDL [http://www.nutrition.org/cgi/content/abstract/134/9/2395]

Clinical trials have noted hypocholesterolemic effects of soy protein intake, but the components responsible are not known. This meta-analysis of 8 randomized controlled trials was conducted to more precisely evaluate the effects of isoflavones on blood LDL cholesterol concentration independently of soy protein level… demonstrating that isoflavones have LDL cholesterol–lowering effects independent of soy protein.

SOY REDUCES BREAST CANCER RISK

http://www.nutrition.org/cgi/content/full/134/11/2911

Soy and Mammographic Breast Density: Plausible Hypothesis but Limited Evidence in Humans     -      Marian L. Neuhouser

"The hypothesis that consumption of soy-containing foods may lower breast cancer risk comes from the observation that breast cancer incidence rates are substantially lower in Asian countries where soy consumption is high, compared with Western countries where soy consumption is low (1,2)... It is in these contexts that soy foods and isoflavones are of particular interest in relation to the prevention of hormone-dependent cancers, such as breast cancer. .. In general, breast density was greater among women with at least some soy consumption at all phases of life compared with women with no or minimal soy intake, but the results were significant only among Caucasian women."

SOY: http://www.nutrition.org/cgi/content/abstract/134/9/2395

Clinical trials have noted hypocholesterolemic effects of soy protein intake, but the components responsible are not known. This meta-analysis of 8 randomized controlled trials was conducted to more precisely evaluate the effects of isoflavones on blood LDL cholesterol concentration independently of soy protein level… demonstrating that isoflavones have LDL cholesterol–lowering effects independent of soy protein.

Or maybe it is the lignan (fiber): Phytoestrogens and breast cancer Regina G Ziegler Am. J. Clinical Nutrition,  Feb 2004;  79:  183 - 184.

Phytoestrogens, which are widely distributed in plants, are structurally similar to mammalian estrogens and can thus bind weakly to estrogen receptors (1). The 3 major classes of phytoestrogens are isoflavones… in soybeans; lignans…in seeds, whole grains, berries, fruit, vegetables, and nuts; and coumestans, … in broccoli and sprouts… No association between isoflavone intake and breast cancer incidence was observed. However, a modest 30% reduction in breast cancer risk, …was seen for women in the highest quartile of lignan intake (median: 0.8 mg/d).