Research. Education. Action.

We are the leading scientific membership organization advancing the science-based understanding of the causes, consequences, prevention and treatment of obesity in order to improve the lives of those affected.

The Obesity Society is a scientific membership organization. We are dedicated to improving people’s lives by advancing the science-based understanding of the causes, consequences, prevention and treatment of obesity.
Access Journal
AI for Obesity Research and Clinical Practice
Foundations of Obesity Care
Physiology of the Weight Reduced State: From Mechanisms to Clinical Application
ORDER NOWOnDemand Courses On Sale Now!

REGISTRATION IS OPEN

November 3-7, 2025

LEARN MORE

Grand Rounds

MEMBER BENEFIT

Connect with TOS's Community of Obesity Experts

LEARN MORE

– FREE to members
– Monthly grand rounds
– Cutting-edge science from leading experts

On Sale Now
Earn up to 15 Group One CME credits / ABIM MOC Points


New TOS Review Course for the ABOM Exam OnDemand

BUY NOW
Coffee with Professor Image

Coffee with the Experts

MEMBER BENEFIT

For TOS Student & Early Career Members

READ MORE

– FREE monthly mentorship advice from leading obesity experts
– Small groups connect early and senior career members
– Enhance learning and career advancement

Clinical Insights for Obesity Management: Past, Present, and Future

WATCH NOW

FREE ONDEMAND WEBINAR

ObesityWeek® 2024 OnDemand

Includes 74.25 CME credits and 16 ABIM MOC points

READ MORE

ON SALE NOW

Research. Education. Action.

We are the leading scientific membership organization advancing the science-based understanding of the causes, consequences, prevention and treatment of obesity in order
to improve the lives of those affected.

The Obesity Society is a scientific membership organization. We are dedicated to improving people’s lives by advancing the science-based understanding of the causes, consequences, prevention and treatment of obesity.
Access Journal

TOS Review Course for ABOM Exam OnDemand

Learn More

On Sale Now
Earn up to 17.5 Group One Credits

Grand Rounds

Learn More

MEMBER BENEFIT
Expert Obesity Science
Starting January 2023

Consensus Statement on Obesity

In 2022, the leading US organizations with a primary focus on obesity came together with the intention of addressing the various roadblocks they faced in efforts to improve access to obesity treatment and reduce the stigma and bias surrounding this disease. The organizations were: The Obesity Society, the Obesity Action Coalition, the Obesity Medicine Association, the American Society for Metabolic and Bariatric Surgery, the Stop Obesity Alliance, and the Academy of Nutrition and Dietetics. As part of our discussion, we agreed that it would be beneficial to come to a consensus on the definition of obesity. Our discussions led us to develop the consensus statement below, which serves as a shared starting point for discussing obesity, aligning with our approach to other chronic diseases. As the core organizations addressing obesity, we have worked together to write this statement and have agreed to use it as the central tenet in our communications regarding obesity.

Consensus Statement

Obesity is a highly prevalent chronic disease characterized by excessive fat accumulation or distribution that presents a health risk and requires lifelong care. Virtually every system in the body is affected by obesity. Major chronic diseases associated with obesity include diabetes, heart disease, and cancer.

The body mass index (weight in kilograms divided by height in meters) is used to screen for obesity, but it does not supersede clinical judgment. BMI is not a measure of body fat. Social determinants, race, ethnicity, and age may modify the risk associated with a given BMI.

Bias and stigmatization directed at people with obesity contribute to poor health and impair treatment.

Every person with obesity should have access to evidence-based treatment.

International Obesity Collaborative

Learn more

Getting Connected

Learn more

Getting Connected

The Obesity Society connects with experts, government/non-government organizations and the public to:

  • Develop, influence and promote vital policies and public positions
  • Create and implement guidelines and cross-discipline learning, sharing and action that advances healthy behaviors
  • Reduce obesity-related bias

Supporting Interactions

Learn more

Supporting Interactions

The Obesity Society works with professionals and various audiences on:

  • Valuable conferences and educational opportunities, including early-career professional development and achievement programs
  • Informative professional/academic and popular publications
  • Essential financial development and support

Increasing Impact

Learn more

Increasing Impact

The Obesity Society also helps leaders, investigators and innovators to:

  • Launch and promote needed public health initiatives
  • Translate basic science and clinical trial results into real-world interventions
  • Expand the boundaries of scientific exploration

Looking for an obesity medicine provider in your area?

Use our Obesity Care Provider Directory to connect with providers.

NEWS YOU CAN USE

ARTICLE

Physical Activity Early in the Day Influences Weight Management, Health Outcomes

ROCKVILLE, Md.— Even though epidemiological evidence has been controversial regarding the optimal timing of physical activity for weight management, the hours of 7 a.m. to 9 a.m. appear to be the most favorable time of day to enhance the association … < Read More >

ARTICLE

Doctors and Advocates Call for Better Testing and Labeling of Drugs for People with Obesity

TAMPA, Fla. — The Obesity Action Coalition (OAC) announces the publication of a “Joint Statement in Support of Closing Gaps in the Drug Approval Process and Drug Labeling for People with Obesity.” The statement is co-signed by the OAC, The Obesity Society … < Read More >

ARTICLE

TOS Past Presidents Comment on SELECT Study Results

ROCKVILLE, Md.— New findings show that the medication known as Wegovy® (semaglutide) can reduce existing heart disease in patients with obesity by 20%, according to a study co-authored by past presidents of The Obesity Society (TOS) and published in The New England Journal of Medicine. … < Read More >

ARTICLE

Country’s Leading Obesity Care Organizations Develop Consensus Statement on Obesity

Six U.S. organizations dedicated to the prevention and treatment of obesity collaborated to develop a consensus statement on obesity, a complex, chronic disease that impacts nearly 42% of adults and 19% of children and adolescents. This unified … < Read More >

RESEARCH GRANTS

Promoting and rewarding new ideas in obesity research.

AWARDS

Recognizing excellence in research, clinical practice, mentoring, and public service.

INFORMATION FOR HEALTH CARE PROVIDERS & PATIENTS

Patient Information Pages

RESEARCH & CLINICAL RESOURCES

Supplying the latest news about the entire obesity field.