Lipids

pp 1–16

Higher Lipophilic Index Indicates Higher Risk of Coronary Heart Disease in Postmenopausal Women

  • Qing Liu
  • Alice H. Lichtenstein
  • Nirupa R. Matthan
  • Chanelle J. Howe
  • Matthew A. Allison
  • Barbara V. Howard
  • Lisa W. Martin
  • Carolina Valdiviezo
  • JoAnn E. Manson
  • Simin Liu
  • Charles B. Eaton
Original Article

Abstract

Fatty acids (FAs) are essential components of cell membranes and play an integral role in membrane fluidity. The lipophilic index [LI, defined as the sum of the products between FA levels and melting points (°C), divided by the total amount of FA: \({\text{LI}} = \frac{{\mathop \sum \nolimits_{k} [{\text{fatty acid}} \times {\text{melting point}}]}}{{\mathop \sum \nolimits_{k} {\text{fatty acid}} }}\)] is thought to reflect membrane and lipoprotein fluidity and may be associated with the risk of coronary heart disease (CHD). Therefore, we examined the associations of dietary and plasma phospholipid (PL) LI with CHD risk among postmenopausal women. We determined dietary LI for the cohort with completed baseline food frequency questionnaires and free of prevalent cardiovascular diseases in the Women’s Health Initiative (WHI) observational study (N = 85,563). We additionally determined plasma PL LI in a matched case-control study (N = 2428) nested within the WHI observational cohort study. Cox proportional hazard regression and multivariable conditional logistic regression were used to calculate HRs/ORs for CHD risk between quartiles of LI after adjusting for potential sources of confounding and selection bias. Higher dietary LI in the cohort study and plasma PL LI in the case-control study were significantly associated with increased risk of CHD: HR = 1.18 (95% CI 1.07–1.31, P for trend <0.01) and OR = 1.76 (95% CI 1.33–2.33, P for trend <0.01) comparing extreme quartiles and adjusting for potential confounders. These associations still persisted after adjusting for the polyunsaturated to saturated fat ratio. Our study indicated that higher LI based on either dietary or plasma measurements, representing higher FA lipophilicity, was associated with elevated risk of CHD among postmenopausal women.

Keywords

Lipophilic index Coronary heart disease Diet Plasma Postmenopausal women 

Abbreviations

BMI

Body mass index

CHD

Coronary heart disease

CI

Confidence interval

CVD

Cardiovascular disease

FA

Fatty acid

HR

Hazard ratio

IQR

Interquartile range

LI

Lipophilic index

MET

Metabolic equivalent of task

MUFA

Monounsaturated fatty acid

OR

Odds ratio

PL

Phospholipid

PUFA

Polyunsaturated fatty acid

RR

Risk ratio

SD

Standard deviation

SFA

Saturated fatty acid

TFA

Trans fatty acid

WHI

Women’s Health Initiative

Copyright information

© AOCS 2017

Authors and Affiliations

  • Qing Liu
    • 1
  • Alice H. Lichtenstein
    • 2
  • Nirupa R. Matthan
    • 2
  • Chanelle J. Howe
    • 1
  • Matthew A. Allison
    • 3
    • 4
  • Barbara V. Howard
    • 5
    • 6
  • Lisa W. Martin
    • 7
  • Carolina Valdiviezo
    • 8
  • JoAnn E. Manson
    • 9
  • Simin Liu
    • 1
  • Charles B. Eaton
    • 1
    • 10
  1. 1.Department of Epidemiology, School of Public HealthBrown UniversityProvidenceUSA
  2. 2.Jean Mayer USDA Human Nutrition Research Center ON AgingTufts UniversityBostonUSA
  3. 3.University of California, San DiegoLa JollaUSA
  4. 4.VA San Diego Healthcare SystemSan DiegoUSA
  5. 5.MedStar Health Research InstituteHyattsvilleUSA
  6. 6.Georgetown-Howard Universities Center for Clinical and Translational ScienceWashington, DCUSA
  7. 7.Division of CardiologyGeorge Washington University School of Medicine and Health SciencesWashington, DCUSA
  8. 8.Medstar Washington Hospital Center and Georgetown University School of MedicineWashington, DCUSA
  9. 9.Brigham and Women’s Hospital, Harvard Medical SchoolBostonUSA
  10. 10.Center for Primary Care and PreventionMemorial Hospital of Rhode IslandPawtucketUSA

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