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Soy protein and serum lipids

S M Potter1

  • 1Department of Food Science and Human Nutrition, University of Illinois at Urbana/Champaign 61801, USA.

Current Opinion in Lipidology
|August 1, 1996
PubMed
Summary

Soy protein intake lowers cholesterol levels in humans. While the exact mechanism is unclear, soy components may impact cholesterol absorption and LDL receptor activity, potentially reducing cardiovascular risk.

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Area of Science:

  • Nutritional Biochemistry
  • Cardiovascular Health
  • Food Science

Background:

  • Soy protein substitution for animal protein is linked to reduced total and LDL-cholesterol.
  • The specific soy components and mechanisms responsible for these effects remain incompletely understood.

Purpose of the Study:

  • To investigate the mechanisms by which soy protein influences cholesterol metabolism and cardiovascular markers.
  • To identify the specific soy components responsible for observed hypocholesterolemic effects.

Main Methods:

  • Review of existing evidence on soy protein's impact on cholesterol absorption, bile acid reabsorption, and endocrine status.
  • Analysis of studies examining LDL receptor activity following soy protein or extract ingestion.
  • Examination of the role of soybean isoflavones, such as genistein, in cardiovascular-related pathways.

Main Results:

  • Soy protein may impair cholesterol and bile acid absorption in some animal models, but not consistently in humans or with soy amino acids.
  • Observed increases in LDL receptor activity in animals and humans after soy consumption.
  • Evidence suggests the isoflavone genistein may inhibit lesion and thrombus formation through second messenger pathways.

Conclusions:

  • Soy protein's cholesterol-lowering effects in humans are not fully explained by impaired absorption or altered endocrine status.
  • Increased LDL receptor activity is a potential mechanism contributing to reduced cholesterol levels.
  • Soybean isoflavones, particularly genistein, show promise in mitigating cardiovascular disease processes.

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