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Scientists dive deep into the biology of obesity

NCT ID NCT00428987

Knowledge-focused Sponsor: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Sep 02, 2026 · Updated 12 times

Summary

This study aims to describe the physical and behavioral traits of overweight and obese adults compared to lean individuals. Researchers will measure hormones, metabolism, food preferences, fitness, sleep, and thinking patterns in 2,000 participants. The goal is to better understand the factors that influence body weight, not to test a treatment.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 2,000 people

The number the study aims to enrol. It can still change while the study runs.

Started

Mar 2007

Lead sponsor

A government research agency

The lead sponsor is the US National Institutes of Health.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

men and women 18 years old and over with BMI \> 30 BMI \> 25 and \< 30 BMI \> 18.5 and \< 25

Ages

18 to 100 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

* INCLUSION CRITERIA: Obese subjects: 1. Obese men and women over the age of 18 years 2. BMI \> 30 Overweight subjects: 1. Overweight men and women over the age of 18 years 2. BMI \> 25 and \< 30 Control subjects (may be matched for age, sex and years of education): 1. Normal weight men and women over the age of 18 years 2. BMI \> 18.5 and \< 25 EXCLUSION CRITERIA: 1. Patients with significant physical limitations that may preclude them from completing the majority of the tests in this study 2. Current unstable medical conditions including cardiac ischemia, severe respiratory insufficiency requiring oxygen therapy, hepatic or cardiac failure as assessed by history and physical exam 3. Any psychiatric condition that would preclude participation in the study 4. Patients unwilling or unable to give informed consent 5. Pregnant woman. Additional exclusion for lean control subjects: 1. Previous history of obesity as an adolescent or adult 2. Current or past history of eating disorders such as anorexia nervosa or bulimia The NIH Patient Recruitment and Public Liaison Office will receive inquiries from interested study subjects. Pre-screening by this office will exclude patients who require more than minimal assistance to complete activities of daily living in order to select subjects who can safely participate in the full phenotyping protocol. All others will be contacted by the protocol team to review exclusion criteria. Eligible patients will be invited to Clinical Research Center for a screening visit.

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Conditions

The condition(s) this trial relates to.

morbid obesity Obesity obesity disorder Overweight

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Healthy volunteers Obesity

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • National Institutes of Health Clinical Center

    RECRUITING

    Bethesda, Maryland, 20892, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.