The Relation Between Adiposity, Inflammation, Glycaemia and Iron Absorption

Overview

A total of 126 premenopausal women (42 lean, 42 obese with central obesity, 42 obese with peripheral obesity) will be recruited. Anthropometric measurements and body composition using DEXA will be collected. Overnight fasted subjects will be asked to give baseline blood samples before consuming a meal containing 6 mg 57Fe in the form of FeSO4. Subjects will return after 14 days and a blood sample will be collected for measurement of isotopic enrichment into red blood cells, serving as well as a baseline for the OGTT. Subjects will then be asked to ingest a solution of glucose (50g) containing 100 mg of iron in the form of sodium ferrous citrate (SFC), after which blood samples will be collected 2 hours post iron and glucose load. All three blood samples collected at baseline, 2 weeks post labeled iron load, and 2 hours post glucose/iron load will be analyzed for their levels of iron, glycaemia and inflammatory parameters.

Full Title of Study: “The Relation Between Adiposity, Inflammation, Glycaemia and Iron Absorption: A Comparison Between Central and Peripheral Adiposity”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Non-Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Basic Science
    • Masking: None (Open Label)
  • Study Primary Completion Date: December 5, 2018

Detailed Description

1. Obese subjects with central and peripheral obesity

During the first phase, overweight/obese subjects with a BMI 28-35 Kg/m2 will be invited to a screening. At the screening, anthropometrics (weight, height, waist circumference) and body composition (using BIA and DEXA) will be measured. Based on the subject's distribution of body fat, those who have a predefined % body fat between 45-55% will be invited to join the study and they would fall into one of the following two groups:

- 42 subjects with >43% fat in the android sector (area from the pelvis to 20% of the distance between the pelvis and the neck cuts) according to the DEXA results (central adiposity) would be recruited

- 42 subjects with <43% fat in the android sector according to DEXA (peripheral adiposity) would be recruited.

2. Lean subjects At the same time, anthropometric (weight, height, waist circumference) and body composition (using BIA and DEXA) measurement will be conducted on interested lean subjects (BMI 20-25).

Overnight fasted subjects:

At T0:

There will be a determination of the type and degree of obesity through the measurement of weight, height, BMI, and WC, followed by both BIA screening and DEXA scan to obtain a more detailed image about the status of the participant.

At T1:

A fasting blood sample of 10 ml (4 ml EDTA coated tubes, 6 ml uncoated tubes) will be drawn to measure the inflammatory status, glycaemia, and iron levels of the participant by determining CRP, alpha-glycoprotein, hepcidin, ferritin, TfR, TIBC, HbA1c, insulin, FPG, serum iron, CBC and lipid profile.

After this blood test, the subject will be given a meal including 57Fe (6 mg iron as FeSO4).

At T2:

A second venous blood sample of 10 ml (4 ml EDTA coated tubes, 6 ml uncoated tubes) will be drawn for analysis of hemoglobin and erythrocyte isotopic composition as well as for the determination of serum ferritin, transferrin receptor, C-reactive protein, alpha-glycoprotein and hepcidin.

At T3:

A third venous blood sample of 10 ml (4 ml EDTA coated tubes, 6 ml uncoated tubes) will be drawn to measure the level of glucose, insulin, TG, FFA, TIBC and serum iron. This blood test will be an indicator of the level of glycaemia and iron appearance in the blood of the subject through the earlier ingestion of OGTT and oral iron load.

Interventions

  • Diagnostic Test: Iron
    • Labelled iron

Arms, Groups and Cohorts

  • Experimental: Obese women: central obesity
    • OGTT with iron
  • Experimental: Obese women: peripheral obesity
    • OGTT with iron
  • Experimental: Lean women
    • OGTT with iron

Clinical Trial Outcome Measures

Primary Measures

  • Iron absorption
    • Time Frame: two weeks
    • Labelled iron enrichment in red blood cells
  • Glycemic response
    • Time Frame: 2 hours
    • oral glucose load

Secondary Measures

  • Iron absorption
    • Time Frame: 2 hours
    • serum iron concentration

Participating in This Clinical Trial

Inclusion Criteria

Exclusion Criteria

  • pregnant women lactating women

Gender Eligibility: Female

Minimum Age: 20 Years

Maximum Age: 50 Years

Are Healthy Volunteers Accepted: Accepts Healthy Volunteers

Investigator Details

  • Lead Sponsor
    • American University of Beirut Medical Center
  • Collaborator
    • ETH Zurich (Switzerland)
  • Provider of Information About this Clinical Study
    • Sponsor
  • Overall Official(s)
    • Omar Obeid, PhD, Principal Investigator, American University of Beirut Medical Center

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