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April 15, 2023Open Access

Relationships between body fat distribution and metabolic syndrome traits and outcomes: a Mendelian Randomization study

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Key result

Genetically higher gluteofemoral fat linked to a protective cardiometabolic profile and lower LDL-C.

  • β -0.19
  • 95% CI -0.28, -0.10
  • P<0.001
  • n=39,076

Why the study?

Although obesity is frequently assessed using BMI, epidemiological studies link body fat distribution to obesity-related outcomes, prompting investigation into their causal relationships with metabolic syndrome traits.

Does genetically instrumented gluteofemoral adipose tissue improve cardiometabolic profiles in the general population?

Population

Participants of the United Kingdom BioBank and IEU Open GWAS Project

Comparison

Genetically determined VAT, ASAT, GFAT, and their relative ratios

Design

Two-sample and multivariable Mendelian randomization study

Authors

BHBrian HuangMassachusetts General HospitalJDJohn DePaoloHospital of the University of PennsylvaniaRJRenae JudyHeart Failure & Transplant

Discussion

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Overview

Supports fat distribution assessment beyond BMI for risk stratification; hypothesis-generating for gluteofemoral fat modulation.

Study Design

Type

Observational (n=39,076)

Structured PICO

Does genetically instrumented gluteofemoral adipose tissue improve cardiometabolic profiles in the general population?

P
Population
39,076 participants of the UK Biobank (ages 40-69, 94% Caucasian) who underwent abdominal MRI scans for fat depot GWAS, and outcome GWAS from IEU Open GWAS Project.
I
Intervention
Genetically instrumented body fat distribution (visceral adipose tissue [VAT], abdominal subcutaneous adipose tissue [ASAT], gluteofemoral adipose tissue [GFAT], and their ratios)
O
Outcome
Metabolic syndrome traits including LDL-c, Apo-B, HDL-c, Apo-A1, total cholesterol, triglycerides, systolic blood pressure, diastolic blood pressure, fasting glucose, HbA1c, and type 2 diabetessurrogate

Main Result

Effect estimate: β -0.19 (95% CI -0.28, -0.10)

p-value: p=< 0.001

Increased absolute and relative gluteofemoral adipose tissue (GFAT) is associated with a favorable cardiometabolic profile independently of BMI, highlighting the importance of body fat distribution in assessing obesity-related risk.

Limitations

  • Wide confidence intervals limited the ability to demonstrate strong associations between central adiposity measures and metabolic syndrome markers.
  • MRI measures of VAT and ASAT may not capture the full extent of abdominal adiposity, such as ectopic fat.
  • Different degrees of transformation and normalization of exposure and outcome data make direct clinical interpretation of MR estimates difficult.
  • MR estimates reflect lifelong genetic variation, allowing only directional conclusions.
  • The GWAS population consisted exclusively of individuals aged 40-69 and was 94% Caucasian, limiting generalizability.
  • Potential confounding by an additional outcome correlated with the genetic instruments cannot be entirely excluded.
  • Wide confidence intervals for VAT and ASAT effects
  • MRI measures may not capture the full extent of abdominal adiposity
  • Exposure and outcome data underwent different degrees of transformation
  • MR estimates reflect lifelong genetic variation, allowing only directional conclusions
  • GWAS consisted exclusively of individuals aged 40-69, 94% Caucasian, limiting generalizability
  • Potential for pleiotropy or confounding by additional outcomes correlated with genetic instruments

Cite This Study

Huang et al. (2023) conducted an observational in Metabolic syndrome (n=39,076). Genetically instrumented gluteofemoral adipose tissue (GFAT) was evaluated on Low density lipoprotein cholesterol (LDL-c) (β -0.19, 95% CI -0.28, -0.10, p=< 0.001). Genetically instrumented increases in absolute gluteofemoral adipose tissue were associated with a protective cardiometabolic profile, including lower LDL cholesterol (β -0.19).

synapsesocial.com/papers/6a0dedb936162e2f4b09b94fhttps://doi.org/10.1101/2023.04.07.23287634
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Causal Pathways from Body Components and Regional Fat to Extensive Metabolic Phenotypes: A Mendelian Randomization Study2020 · 20 citations
  2. 2The role of the gluteofemoral adipose tissue in cerebrovascular disease risk: evidence from a mendelian randomization and mediation analysis2024 · 1 citations
  3. 3Inherited basis of visceral, abdominal subcutaneous and gluteofemoral fat depots2022 · 164 citations
  4. 4Adiposity distribution and risks of 12 obesity-related cancers: a Mendelian randomization analysis2025
  5. 5A Beneficial Role for Gluteofemoral Adipose Tissue in Cerebrovascular Disease2025 · 8 citations