every subject has it pro/con "proof" as shown in the following excerpt from: [Am J Health-Syst Pharm 58(8):663, 660, 2001. © 2001 ASHP, Inc.] My point with this is that, if you look, you will find stuff on the net to support your viewpoint, no matter WHAT that viewpoint may be. So, as a consummer, it is YOUR job to look through the info and make an informed choice.
hope this helps. excerpt follows:
A meta-analysis of 38 controlled clinical trials concluded that soy protein consumption (average intake, 47 g/day) was associated with an average reduction of 9% in total cholesterol, 13% in LDL cholesterol, and 10% in triglycerides, with no change in high-density-lipoprotein (HDL) cholesterol. In a randomized, double-blind trial, soy protein (56 or 90 mg of isoflavones per day) was substituted for animal protein in the diet of 66 postmenopausal women with hyperlipidemia.[8,9] Non-HDL cholesterol was reduced 7%, a significant change, and HDL cholesterol increased 3-5%. No significant effect on total cholesterol or triglycerides was seen. A randomized crossover study in 26 men with and without hyperlipidemia found that soy protein (isoflavone content not specified) substituted for animal protein significantly reduced LDL cholesterol levels by 6% in both groups. No significant difference in total cholesterol, HDL cholesterol, or triglycerides was noted. Significant reductions in total cholesterol (6%) and LDL cholesterol (7%) were observed in 51 perimenopausal women randomized in double-blind fashion to receive either a soy protein supplement (34 mg of phytoestrogens given once daily or in divided doses twice daily) or placebo and then crossed over to the other treatment. Triglycerides and HDL cholesterol were not significantly affected. Crouse et al. conducted a randomized, double-blind study in which soy protein supplements providing 37 or 62 mg of isoflavones per day significantly reduced total cholesterol (4-8%) and LDL cholesterol (6-8%) in 156 healthy men and women. Triglycerides and HDL cholesterol were not affected. Soy protein may protect against cardiovascular disease by means other than cholesterol reduction. Most studies have not demonstrated a clinically significant antihypertensive effect of soy consumption. However, one study did note a significant, 5-mm Hg decrease in diastolic blood pressure in normotensive perimenopausal women given a soy protein supplement twice daily (a total of 34 mg of phytoestrogens per day). Animal and in vitro studies suggest that soy isoflavones slow the progression of atherosclerotic plaques and may alter cellular processes involved in lesion development.[3,13,14] In a small, placebo- controlled crossover study in 21 women, soy isoflavones 80 mg/day improved systemic arterial compliance (elasticity) by 26% compared with placebo. Another study, in which isoflavones derived from red clover were given to 17 women, produced similar results. Soy protein may also protect LDL cholesterol from oxidation.[3,17,18] To date, no studies have evaluated the effects of soy protein or isoflavones on cardiovascular morbidity and mortality.<<<<