Composite Dietary Antioxidant Index and Metabolic Health in Overweight/Obesity in U.S. Adults

NCT07291726 | Withdrawn

• 1 other identifier: NHANES_CrossSec_2025_01
• Study Type: observational
• Target: N/A
• Locations: 1 country
• Sites: 1

Brief Summary

This cross-sectional study draws on data from the National Health and Nutrition Examination Survey (NHANES) database. The primary objective is to investigate the associations between the Composite Dietary Antioxidant Index (CDAI) and overweight/obesity, as well as the related metabolic abnormalities, among the U.S. general population. By analyzing this large-scale, nationally representative dataset, the investigators seek to generate evidence that can inform public health policies and clinical practice-ultimately contributing to a deeper understanding of population-level health challenges and the development of targeted strategies to address them.

Conditions

Metabolic Health; Overweight/Obesity

Outcome Measures

Primary Outcomes (2)

• Overweight/Obesity Assessed by Body Mass Index (BMI)

  Body Mass Index (BMI) will be calculated as weight (in kilograms) divided by the square of height (in meters). According to the World Health Organization's classification, a BMI of 25.0 - 29.9 kg/m² is considered overweight, and a BMI of 30.0 kg/m² or higher is considered obese. Data on weight and height will be obtained from the NHANES dataset.

  Baseline: Data collection for calculating BMI occurs during the specific NHANES survey cycle relevant to this study (single - time - point cross - sectional assessment).

• Metabolic Phenotype Classification (Metabolically Healthy vs. Unhealthy) Assessed by NCEP ATP III Metabolic Syndrome Components

  Metabolic phenotypes are classified as metabolically healthy or unhealthy based on the components of metabolic syndrome defined in the third report of the National Cholesterol Education Program (NCEP) Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (Adult Treatment Panel III). Waist circumference data is not used in this classification due to its high correlation with BMI. A participant is defined as metabolically healthy if they have none or only one of the following four metabolic abnormalities: (1) Serum triglycerides (TG) ≥ 150 mg/dL; (2) Serum high-density lipoprotein cholesterol (HDL-C) \< 40 mg/dL in men or \< 50 mg/dL in women; (3) Fasting glucose ≥ 100 mg/dL or use of hypoglycemic drugs; (4) Blood pressure ≥ 130/85 mmHg or use of antihypertensive drugs. A participant is defined as metabolically unhealthy if they have two or more of the above metabolic abnormalities. Relevant data will be retrieved from the NHANES database.

  Baseline: Data on metabolic components for phenotype classification will be collected during the corresponding NHANES survey cycle for this study, reflecting a single-time-point cross-sectional assessment.

Study Arms (4)

CDAI Q1 (Lowest Quartile)

Other: None (Observational)

CDAI Q2 (Second Quartile)

Other: None (Observational)

CDAI Q3 (Third Quartile)

Other: None (Observational)

CDAI Q4 (Highest Quartile)

Other: None (Observational)

Interventions

None (Observational) OTHER

This is an observational study with no active intervention implemented. Its primary aim is to analyze the relationship between the Composite Dietary Antioxidant Index (CDAI) and overweight/obesity, as well as the associated metabolic abnormalities, using the dataset-with no experimental manipulation involved.

CDAI Q1 (Lowest Quartile); CDAI Q2 (Second Quartile); CDAI Q3 (Third Quartile); CDAI Q4 (Highest Quartile)

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

The study population consists of individuals from the National Health and Nutrition Examination Survey (NHANES) database. It includes participants aged 18 and above with complete data on dietary antioxidant index and body mass index, representing a nationally representative sample of the U.S. population.

You may qualify if:

• Participants with complete data on composite dietary antioxidant index from the NHANES database
• Participants with complete body mass index (BMI) data from the NHANES database
• Individuals aged 18 years and older

You may not qualify if:

• Participants with missing key data (composite dietary antioxidant index or BMI)
• Individuals who are pregnant

Sponsors & Collaborators

• University-Town Hospital of Chongqing Medical University: lead

Study Sites (1)

University Town Hospital of Chongqing Medical University

Chongqing, Chongqing Municipality, 401331, China

Location

Related Links

• National Health and Nutrition Examination Survey (NHANES)

MeSH Terms

Conditions

Overweight; Obesity

Condition Hierarchy (Ancestors)

Overnutrition; Nutrition Disorders; Nutritional and Metabolic Diseases; Body Weight; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Study Design

• Study Type: observational
• Observational Model: ECOLOGIC OR COMMUNITY
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Attending Physician

Study Record Dates

• First Submitted: September 29, 2025
• First Posted: December 18, 2025
• Study Start: April 1, 2024
• Primary Completion: July 4, 2024
• Study Completion: August 6, 2024
• Last Updated: February 17, 2026

Record last verified: 2026-02

Locations

CN (1)