Effects of adiposity on plasma lipid response to reductions in dietary saturated fatty acids and cholesterol

Michael R. Flock, Michael H. Green, Penny M. Kris-Etherton

Research output: Contribution to journalReview articlepeer-review

45 Scopus citations

Abstract

Dietary SFA and cholesterol are major targets for reducing plasma total and LDL cholesterol as a strategy to decrease cardiovascular disease risk. However, many studies show that excess adiposity attenuates the expected lipid and lipoprotein response to a plasma cholesterol-lowering diet. Diets low in SFA and cholesterol are less effective in improving the lipid profile in obese individuals and in patients with metabolic syndrome. In contrast, lean persons are more responsive to reductions in dietary SFA and cholesterol. Multiple mechanisms likely contribute to the altered plasma lipid responses to dietary changes in individuals with excess adiposity. The greater rate of hepatic cholesterol synthesis in obese individuals suppresses the expression of hepatic LDL receptors (LDLR), thereby reducing hepatic LDL uptake. Insulin resistance develops as a result of adipose-tissue induced inflammation, causing significant changes in enzymes necessary for normal lipid metabolism. In addition, the LDLR-mediated uptake in obesity is attenuated by alterations in neuroendocrine regulation of hormonal secretions (e.g. growth hormone, thyroid hormone, and cortisol) as well as the unique gut microbiota, the latter of which appears to affect lipid absorption. Reducing adipose tissue mass, especially from the abdominal region, is an effective strategy to improve the lipid response to dietary interventions by reducing inflammation, enhancing insulin sensitivity, and improving LDLR binding. Thus, normalizing adipose tissue mass is an important goal for maximizing the diet response to a plasma cholesterol-lowering diet. Adv. Nutr.

Original languageEnglish (US)
Pages (from-to)261-274
Number of pages14
JournalAdvances in Nutrition
Volume2
Issue number3
DOIs
StatePublished - May 2011

All Science Journal Classification (ASJC) codes

  • Food Science
  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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