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Low fat and high monounsaturated fat diets decrease human low density lipoprotein oxidative susceptibility in vitro.

R L Hargrove1, T D Etherton, T A Pearson

  • 1Graduate Program in Nutrition, The Pennsylvania State University, University Park, PA 16802, USA.

The Journal of Nutrition
|June 1, 2001
PubMed
Summary
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High monounsaturated fatty acid (MUFA) diets, including those with peanuts and olive oil, show similar effects on low-density lipoprotein (LDL) oxidation resistance compared to lower-fat diets. This suggests MUFA-rich foods can be part of heart-healthy eating patterns.

Area of Science:

  • Cardiovascular Science
  • Nutritional Biochemistry
  • Lipid Metabolism

Background:

  • Oxidative modification of low-density lipoprotein (LDL) is a key factor in atherosclerosis development.
  • LDL enriched in monounsaturated fatty acids (MUFA) appears more resistant to oxidation than LDL rich in polyunsaturated fatty acids (PUFA).
  • High MUFA diets offer an alternative to traditional lower-fat cholesterol-lowering diets, but their impact on LDL oxidative susceptibility is less understood.

Purpose of the Study:

  • To evaluate the effects of high MUFA diets (peanuts, peanut butter, peanut oil, olive oil) on LDL oxidative susceptibility in men and women.
  • To compare the effects of high MUFA diets with a Step II low-fat cholesterol-lowering diet.
  • To assess if different MUFA sources impact LDL oxidation differently.

Main Methods:

Related Experiment Videos

  • A randomized, double-blind, five-period crossover study involving 20 participants.
  • Dietary interventions included: Average American diet, Step II diet, olive oil diet, peanut oil diet, and peanuts plus peanut butter diet.
  • LDL oxidative susceptibility was measured using ex vivo oxidation assays, assessing lag time and oxidation rate.

Main Results:

  • The Average American diet showed the shortest LDL oxidation lag time.
  • Step II, olive oil, and peanuts plus peanut butter diets resulted in longer lag times compared to the Average American diet.
  • The olive oil diet exhibited a slower LDL oxidation rate, linked to lower LDL PUFA content.

Conclusions:

  • Lower-fat and higher-fat cholesterol-lowering diets rich in MUFA demonstrate comparable effects on LDL oxidative resistance.
  • Various high MUFA food sources can be included in diets without increasing LDL oxidation susceptibility.
  • Dietary fat composition, particularly the MUFA to PUFA ratio, influences LDL's resistance to oxidation.