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Socioecological Factors Associated With Ethnic Disparities in Bariatric Surgery Utilization and Post-WLS

Completed
Conditions
Obesity
Metabolic Syndrome
Registration Number
NCT06342050
Lead Sponsor
University of Texas Southwestern Medical Center
Brief Summary

The goal of this cross-sectional observational study is to examine potential relationships between the blood and gut microbiota of patients with obesity before and after weight loss surgery (WLS) and evaluate potential ethnic differences in the blood and gut microbiotas before and after the WLS.

The main aims / objectives of this sub-study are:

* Aim 1. Compare the relationship between the blood and the gut microbiomes among a sample of (1) pre-WLS and (2) 6-month post-WLS participants.

Hypothesis: Blood bacterial composition will resemble that of the gut microbiome among pre-WLS participants. Because the effect of WLS on the blood microbiome is not known, our post-WLS results will be mostly exploratory.

* Aim 2. Determine racial differences in the blood microbiome of the pre- and post-WLS groups.

Hypothesis2: Ethnic differences will be detected in both the pre- and post-WLS groups.

Detailed Description

A subgroup of participants from the main study will be invited to participate in a cross-sectional sub study evaluating the relationship between blood and gut microbiotas. A total of 100 participants will be recruited, 50 participants will be recruited from the "non-completers" and the other 50 participants will be recruited from the "6 months post-WLS" follow-up group of our main project.

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
24
Inclusion Criteria
  • 18-60 years old
  • Will belong to either Non-Hispanic Whites (NHW) or Non-Hispanic Blacks (NHB) ethnic groups
  • "No-WLS" participants will have a BMI >35 kg/m2 (threshold BMI for WLS) whereas "6 months post-WLS" participants will have no BMI requirements.
Exclusion Criteria
  • Having taken antibiotics in the previous 6 months;
  • Metformin, proton pump inhibitors, probiotics, or prebiotics in the previous month;
  • Currently following a vegetarian diet;
  • Pregnancy;
  • Having any infection in the previous month; and
  • Having a comorbid disease that might alter the blood microbiome composition (e.g., renal failure) or the intestinal permeability (e.g., IBS).

Study & Design

Study Type
OBSERVATIONAL
Study Design
Not specified
Primary Outcome Measures
NameTimeMethod
Gut Microbial CompositionStool samples will be collected at one time point only, within a week to their in person appointment.

Gut microbial composition will be measured by performing whole metagenome sequencing in samples previously stored in Zymo stool collection tubes.

Fasting Glucose (mg/dL)Baseline

Fasting glucose will be measured after a 12h fast.

Blood Microbial CompositionBlood samples will be collected in fasting conditions at the Baseline visit.

Blood microbial composition will be measured by performing 16S rRNA (ribosomal ribonucleic acid) in blood samples previously stored in Zymo blood collection tubes.

Body Height (meters)Baseline

Body height will be measured with a stadiometer.

Fat Mass (Kg)Baseline

Body fat mass will be measured by using the SECA mBCA 515.

Skeletal Muscle Mass (kg)Baseline

Skeletal muscle mass will be measured by using the SECA mBCA 515.

Fasting Insulin (mIU/L)Baseline

Fasting insulin will be measured after a 12h fast.

Body water (%)Baseline

Body water percentage will be measured by using the SECA mBCA 515.

Lipopolysaccharides (%)Baseline

Lipopolysaccharides will be measured after a 12h fast.

Body Weight (kg)Baseline

Body weight will be measured with a calibrated SECA scale.

Fat-free Mass (Kg)Baseline

Fat-free mass will be measured by using the SECA mBCA 515.

Lipopolysaccharides binding protein (mIU/L)Baseline

Lipopolysaccharides binding protein will be measured after a 12h fast.

Secondary Outcome Measures
NameTimeMethod

Trial Locations

Locations (1)

UT Southwestern Medical Center

🇺🇸

Dallas, Texas, United States

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