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International Weight Control Registry
Who can join
Ages 18 and older · All sexes · Healthy volunteers welcome
Full 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
About the study
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.
Sponsor: Tufts University · Participants: 100,000 · Started: Dec 10, 2020
Contact the study team
- James E Friedman, MPH · Phone: 205-962-8185
- Jennifer L Oslund, MS · Phone: 702-468-2263
Official record on ClinicalTrials.gov — NCT04907396
Locations in the U.S.
| Alabama | University of Alabama at Birmingham, Birmingham |
| Colorado | University of Colorado, Denver, Denver |
| Kansas | University of Kansas Medical Center, Kansas City |
| Louisiana | Pennington Biomedical Research Center, Baton Rouge |
| Massachusetts | Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston |
| New Hampshire | University of New Hampshire, Durham |
| New York | United States Military Academy, West Point, West Point |
Conditions
From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.