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Recruiting NCT04907396

NCT04907396 International Weight Control Registry

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Clinical Trial Summary
NCT ID NCT04907396
Status Recruiting
Phase
Sponsor Tufts University
Condition Weight Loss
Study Type OBSERVATIONAL
Enrollment 100,000 participants
Start Date 2020-12-10
Primary Completion 2025-12-01

Eligibility & Interventions

Sex All sexes
Min Age 18 Years
Max Age N/A
Study Type OBSERVATIONAL

Eligibility Fast-Check

Enter your details for a quick preliminary check. This does not replace medical advice.

What to Expect as a Participant

This is an observational study. You will not receive an experimental treatment; researchers will collect data based on your existing condition or standard treatment.

This trial targets 100,000 participants in total. It began in 2020-12-10 with a primary completion date of 2025-12-01.

⚠ This information is for research awareness only. Always consult your physician before joining any clinical trial. Participation is voluntary and you may withdraw at any time.

Brief Summary

The IWCR is a global scientific study aimed at better understanding the opportunities and barriers for reducing the prevalence of obesity by collecting information from people who have experience with weight management in their everyday lives. The investigators seek to gather information on a wide range of weight management experiences, ranging from weight loss and weight loss maintenance to weight gain and inability to lose weight.

Eligibility Criteria

Inclusion Criteria: * The IWCR is open to anyone 18 years or older who is considering weight loss, is actively engaged in weight loss, or has previously attempted weight loss (including successful and unsuccessful attempts) Exclusion Criteria: 1. Minors, below the age of 18 2. Adults who are not able to give informed consent online and complete online surveys

Contact & Investigator

Central Contact

James E Friedman, MPH

✉ jfriedman@uabmc.edu

📞 205-962-8185

Principal Investigator

Susan B Roberts, PhD

PRINCIPAL INVESTIGATOR

Tufts University

Frequently Asked Questions

Who can join the NCT04907396 clinical trial?

This trial is open to participants of all sexes, aged 18 Years or older, studying Weight Loss. Full inclusion and exclusion criteria are listed in the Eligibility Criteria section. Always confirm your eligibility with the research team before applying.

Is NCT04907396 currently recruiting?

Yes, NCT04907396 is actively recruiting participants. Contact the research team at jfriedman@uabmc.edu for enrollment information.

Where is the NCT04907396 trial being conducted?

This trial is being conducted at Birmingham, United States, Denver, United States, Kansas City, United States, Baton Rouge, United States and 3 additional locations.

Who is sponsoring the NCT04907396 clinical trial?

NCT04907396 is sponsored by Tufts University. The principal investigator is Susan B Roberts, PhD at Tufts University. The trial plans to enroll 100,000 participants.

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ClinicalMetric — Independent clinical trial intelligence platform. Not affiliated with NIH, ClinicalTrials.gov, the U.S. FDA, or any pharmaceutical company, hospital, or clinical research organization. Trial data is sourced from ClinicalTrials.gov for informational purposes only and does not constitute medical advice. Do not make any treatment, enrollment, or health decisions based solely on information found here — always consult a qualified healthcare professional. Full Disclaimer  ·  Last Reviewed: September 2026  ·  Data Methodology