Study Supports Soy Cholesterol Benefits…
Soybean seeds (Photo credit: IITA Image Library)
Despite past evidence suggesting that eating soy might only lower cholesterol in those whose bodies are able to convert it to an estrogen-like compound called equol, a new study shows soy might benefit a wider range of people.
Canadian researchers discovered that a diet high in soy isoflavones lowered “bad” cholesterol ( LDL ) about equally in people who were considered equol producers and in those who were not. The equol producers, however, maintained their previous levels of “good” HDL cholesterol, while the non-producers’ HDL levels also dropped.
Nutrition researchers at the University of Toronto in Canada used three previous studies to test whether the ability to produce equol from soy products was linked to changes in cholesterol.
The researchers analyzed data on 85 people who participated in one of the three studies. In each of the studies the participants ate between 30 grams and 52 grams of soy foods including: tofu burgers or tofu hot dogs every day over four weeks.
Before they started eating the soy, both equol and non-equol producers had LDL cholesterol in the range that would be considered high according to the American Heart Association (AHA). Their HDL cholesterol was also considered low.
For LDL cholesterol, the AHA says a reading between 160 milligrams per deciliter (mg/dL) and 189 mg/dL is high, while HDL cholesterol below 60 mg/dL is considered low and not protective against heart disease.
After the study, the 33 equol producers’ HDL stayed about the same, while the non-equol producers’ dropped from about 48 mg/dL to about 46 mg/dL.
As for their LDL cholesterol, the equol producers’ fell from about 169 mg/dL to about 152 mg/dL. The non-equol producers’ fell from about 174 mg/dL to about 153 mg/dL.
The LDL reductions are large, the researchers reported in the American Journal of Clinical Nutrition, although that was likely because one of the three studies looked at weight reduction, and that would influence the results.
A 2006 review by the AHA nutrition committee of 22 randomized trials looking at soy and the levels of cholesterol said the LDL reduction they observed was relatively small in given the amount of soy a person would have to eat every day to achieve it.
Eating soy helps displace foods that can contribute to heart disease…
For example…”If you’re having a soy burger you may be displacing a hamburger,” they explained; “Overall, soy should only be one part of a cholesterol-lowering diet.” they concluded.
SOURCE: American Journal of Clinical Nutrition (online) February 1, 2012.
This article is for informational and educational purposes only; It is not intended to provide medical advice, diagnosis or treatment. Consult your doctor or healthcare professional.