The cholesterol lowering effect of soy milk and its role of heart disease was widely recognized in the mid 90s when the results of a meta-analysis of 38 clinical studies were published. The results demonstrated that a diet with significant soy protein reduces Total Cholesterol, LDL cholesterol (the "Bad" cholesterol) and Triglycerides.
The average consumption in these studies was 47 grams per day of soy protein, which is a considerable amount. One way to include this is to try a soy protein beverage or powder that may add 20 grams preserving. Soy protein was effective even in people who were already following the American Heart Association's 30 percent-fat diet. Soy protein appears to lower triglyceride levels while preserving HDL cholesterol.
Researchers Erdman & Potter in 1993 reported in the American Journal of Clinical Nutrition a 12 percent drop in cholesterol when 20 to 25 grams of soy protein and fiber were included in the diet. Soy beans contain soluble fiber, which is known to interfere with the absorption and metabolism of cholesterol.
source: http://www.healthcastle.com/herb_soy.shtml
As a result of these findings, in 1999, FDA authorized a health claim about the relationship between soy protein and Coronary Heart Disease (CHD) on labelling of foods containing soy protein.
A heart health claim can be found on qualified soy products.
Health Claim:
Diets low in saturated fat and cholesterol that include 25 grams of soy protein a day may reduce the risk of heart disease. One serving of [name of produce] provides [amount]g of soy protein.
A few recent studies released in 2005 found that soy only had a modest effect on cholesterol levels. The American Heart Association no longer recommends soy for heart disease. FDA is currently reviewing its policy on soy health claim. So what should you do? Enjoy your soy foods like before. It may not lower cholesterol to an extent we originally thought, but it certainly does not harm our health!
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