Advancing Obesity Science.
Transforming Care. Improving Lives.
For more than 40 years, The Obesity Society (TOS) has been the leading scientific authority driving progress in obesity research, evidence-based care, education, and advocacy. Together with our members and partners, we translate rigorous science into real-world solutions that improve health outcomes for people living with obesity.
Welcome to The Obesity Society
Where Science Becomes Better Care
The Obesity Society (TOS) is the trusted home for obesity science—bringing together researchers, clinicians, educators, and advocates to accelerate discovery, remove barriers to care, and elevate the quality of obesity treatment worldwide.
Our members lead groundbreaking research, develop clinical best practices, and transform patient experiences by turning data, lived experience, and innovation into meaningful action.
Welcome to The Obesity Society
Where Science Becomes Better Care
The Obesity Society (TOS) is the trusted home for obesity science—bringing together researchers, clinicians, educators, and advocates to accelerate discovery, remove barriers to care, and elevate the quality of obesity treatment worldwide.
Our members lead groundbreaking research, develop clinical best practices, and transform patient experiences by turning data, lived experience, and innovation into meaningful action.
Mission-Driven Impact
Turning Evidence into Impact
The mission of The Obesity Society (TOS) is to advance the science, prevention, and treatment of obesity through promoting excellence in research, clinical care, education, and policy. We support a multidisciplinary professional community that fosters collaboration and networking across all fields related to obesity. TOS welcomes members of all backgrounds. We promote equitable access to evidence-based care and work with partners to eliminate stigma and discrimination related to obesity.
Progress is happening.
Mission-Driven Impact
Turning Evidence into Impact
The mission of The Obesity Society (TOS) is to advance the science, prevention, and treatment of obesity through promoting excellence in research, clinical care, education, and policy. We support a multidisciplinary professional community that fosters collaboration and networking across all fields related to obesity. TOS welcomes members of all backgrounds. We promote equitable access to evidence-based care and work with partners to eliminate stigma and discrimination related to obesity.
Progress is happening.
Core Strengths
Why The Obesity Society
The Gold Standard in Obesity Science
Respected worldwide for promoting evidence-driven, scientifically rigorous obesity science.
Translational by Design
We translate science into practice, policy, and education.
Comprehensive & Inclusive
Addressing obesity’s complexity through a welcoming, interdisciplinary community of experts worldwide.
A Home for Growth & Connection
With five generations in today’s workforce, from mentorship and education to collaboration and leadership development, TOS supports careers — and the next generation of leaders.
Membership-Focused
A Place Where You Belong. Where Progress Happens.
TOS is more than a professional society. It’s a trusted, inclusive space where diverse, brilliant, and passionate individuals come together with a shared commitment to improving lives through science.
Members describe TOS as:
- A source of pride and purpose
- A place of rigorous, credible knowledge
- A collaborative community—“the moment I found my tribe”
Here, innovation thrives. Partnerships grow. And meaningful change is created—together.
HIGHLIGHTED MEMBER
Tracy Norfleet, MD, MBA
Obesity Medicine Specialist
St. Louis, Missouri
HIGHLIGHTED MEMBER
Ted Kyle, RPh, MBA
Weight Bias and Stigma
Pittsburgh, Pennsylvania
HIGHLIGHTED MEMBER
Christina Nguyen, MD
Obesity Medicine Specialist
Flowery Branch, Georgia
Take the Next Step
Get Involved.
Join Today.
As a member of the TOS community, you are part of a global, multidisciplinary network of researchers, clinicians, educators, and advocates working to address one of the most complex and pressing public health challenges of our time.
MEMBER BENEFITS:
- Education & Resources: Access evidence-based research, clinical guidelines, webinars, and on‑demand learning, including Obesity and Obesity Science & Practice journals.
- Networking & Collaboration: Connect with leading experts through committees, sections, and events like ObesityWeek®.
- Advocacy & Policy: Support efforts to advance recognition of obesity as a chronic disease and expand access to quality care.
- Professional Development: Build your career with leadership opportunities, mentorship, and flexible On-Demand programs for all career stages.
REAL-LIFE RESULTS
We Generate Results for Our Network
GET CONNECTED
Check Out Our Upcoming Events
Get connected with the latest developments in obesity research, care, and policy. Our upcoming events bring together leading experts, researchers, clinicians, and advocates through conferences, webinars, workshops, and virtual learning opportunities.
Explore our upcoming events and find opportunities to learn, connect, and lead.
The Obesity Society News
The Official ObesityWeek® News
The Obesity Society News Official ObesityWeek News
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How Nutrition and Dialogue Progress in Tandem With Obesity Care
on November 15, 2026 at 5:05 pmIn an opening day Key Lecture, Colleen Sloan, PA-C, RDN, challenged clinicians to envision nutritional plates that evolve with and reflect the stages and crucial conversations accompanying a patient's journey toward better well-being.
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Key Lecture Explores Full Spectrum of Treatment Options Beyond GLP-1s
on November 15, 2026 at 5:05 pmEileen Seeholzer, MD, MS, will discuss why obesity care requires time, sustainable plans, and multiple approaches.
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Panel Discusses Growing Use of GLP-1s Beyond Traditional Target Population
on November 15, 2026 at 5:05 pmPanelist Alaina Vidmar, MD, DABOM, previews a session on health considerations in GLP-1 therapy at different ages.
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Overcoming Life’s Disruptions: Tips for Clinicians and Those Living With Obesity
on November 15, 2026 at 5:05 pmJoy DeBellis, DNP, FNP-C, DipACLM, PNAP, will present a Key Lecture about foundational treatment, barriers, and moving on after life goes awry.
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TOS Teams Up With Korean Society for the Study of Obesity at Session on Adipose Tissue
on November 15, 2026 at 5:05 pmThis first-ever collaborative session will highlight South Korean progress in obesity research and new understandings in basic biology and precise interventions.
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Breast Cancer Treatment: How Does It Impact and How Is It Impacted by Metabolic Health?
on November 15, 2026 at 5:05 pmThe session's chair, Kristy Brown, PhD, previews discussions on the latest research into translating population level data about the benefits of physical activity and weight reduction to individual breast cancer therapy.
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Welcome to ObesityWeek 2026!
on November 15, 2026 at 5:05 pmPresident Jacqueline M. Stephens, PhD, FTOS, shares tips for getting the most out of the conference and highlights the benefits of exploring ideas with fellow attendees.
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What Should ‘Body Positivity’ Mean Today?
on November 15, 2026 at 5:05 pmA leader in the psychology of obesity, Robyn Pashby, PhD, FTOS, will ask her audience to reconsider the debate around body positivity by focusing on the enduring objectives of obesity care.
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How Do Ultra-Processed Foods Affect Developing Brains?
on November 15, 2026 at 5:05 pmKey Lecturer Michael Goran, PhD, will examine connections between early nutrition, obesity, and the in-between trajectories.
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What Are We Still Discovering About Adipose Tissue?
on November 15, 2026 at 5:05 pmThis symposium will share the latest information on the dynamic and differing roles of beige, brown, and white fat depots.