Dietary, Physiological, Genetic, and Behavioral Predictors of Health in a Young, Ethnically-Mixed Population

Dietary intervention and other strategies to prevent unhealthy weight gain and the development of obesity should be based on knowledge of dietary, physiological, genetic and behavioral determinants and their contributing interactions. Identifying these determinants is difficult because physiological susceptibility to specific dietary and behavioral factors implicated in unhealthy weight gain differs between populations and individuals within the populations. The research challenge is identifying specific determinants in a free-living, adult population.

Understanding the interaction between diet and the underlying susceptibility factors such as physiologic, genetic and epigenetic, and behavioral factors mandate an integrated approach.

This integrated approach should include understanding the interplay of physiological factors (genetics, epigenetics, taste preferences, susceptibility to energy excess, etc.) and behavioral factors (food cravings, restraint, disinhibition, physical activity) as each of these domains is a potential driving force in energy expenditure, food preference, dietary choices, and food intake.

Which of these factor(s) is most important? The investigators propose that by examining dietary, physiological, genetic, and behavioral factors in an integrated fashion we will gain insight into the obesity epidemic and identify the most important determinants of weight gain. As a secondary aim, the investigators will identify a single parsimonious collection of factors and develop strategies to mitigate the risks of developing obesity.

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Key information

Conditions

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

Age range

20 year–35 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Pennington Biomedical Research Center

Baton Rouge, Louisiana, 70808, United States

About this study

This is a prospective, longitudinal, clinical study using an epidemiological approach. The sample consists of 90 free-living participants aged 20-35 years. The participants will undergo a series of assessments in the domains of diet, physiological factors, and behavioral factors at baseline and every 12 months for 2 years.

OBJECTIVES

Identify dietary, physiological, genetic and behavioral determinants of unhealthy weight gain in healthy, young, ethnically-mixed men and women.
Identify relationships between genetic measures of taste perception and the determinants of unhealthy weight gain in the said population.
Identify relationships among the determinants of unhealthy weight gain that contribute to an individual's susceptibility to obesity.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Inclusion criteria will be healthy men and women between the ages of 20-35, with BMI < 27.5 kg/m2, and fasting blood glucose < 126 mg/dl.

Exclusion criteria

History of diabetes, history of obesity (BMI > 30).
History of known inherited medical conditions that might influence future health status.
Current or planned medication usage that might influence future health status.
Prior serious injuries/surgeries that might influence future health status.
Women who are pregnant or breastfeeding (once enrolled, pregnancy will not cause subjects to be terminated from the study).
Women who are < 6 months postpartal, or women who have discontinued breastfeeding < 3 months prior to screening.
History of cancer (including skin cancer) within 5 years.
History or organ transplant.
Previous diagnosis with HIV, Hepatitis B or C, or tuberculosis.
Abuse of alcohol or illegal drugs.
Abnormal EKG.
Presence of pacemaker, defibrillator, or implanted metal.
History of eating disorders and abnormal psychological scores for the screening measures described under Psychological Assessment Measures in the Appendix. This psychological screening will be conducted approximately two weeks prior to outpatient testing.

Treatment and study plan

Primary outcomes

Changes in body weight

Time frame: Annually over 2 years

Changes in body weight (kg) from baseline

Secondary outcomes

Changes in fat mass

Time frame: Annually over 2 years

Changes in fat mass (kg) from baseline

Sponsors and collaborators

Lead sponsor

Pennington Biomedical Research Center

Other

Registry information

Acronym: InSight

Important dates

Study start: 2008
Primary completion: 2030
Study completion: 2030
First posted: Jul 24, 2009
Registry last updated: Aug 22, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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