The Obesity Society, commonly abbreviated as TOS, is the main scientific and professional organization in the United States for people who study and treat obesity. Founded in 1982, it is based in Rockville, Maryland. Its members are not the general public; they are the researchers, physicians, surgeons, dietitians, educators, and students who do the underlying work. Around 2,800 professionals from across the country and beyond belong to it.

Understanding where TOS fits is easier by contrast. A federal institute funds the science. A patient nonprofit advocates for the people affected. The Obesity Society is the place where the scientists and clinicians themselves gather, compare findings, set standards, and train the next generation. Its declared aim is to advance the highest quality of research, clinical care, education, and policy in the field, summed up in its vision of solving the challenges of obesity through deeper understanding and coordinated action.

Publishing is one of the society's central activities. TOS produces the journal Obesity, a peer-reviewed title that is among the most cited in the field and a primary venue for new obesity research. It also publishes Obesity Science and Practice, which leans toward clinical and applied work. For a clinician or researcher, getting a study into these journals is a meaningful marker, and for everyone else the journals are where much of the evidence that later reaches patients first appears.

The society is probably best known to the wider health world for ObesityWeek, which it bills as the largest scientific meeting on obesity anywhere. The conference pulls together basic scientists, clinical researchers, behaviorists, epidemiologists, surgeons, and policymakers for several days of presentations, debate, and networking. New data is unveiled there, treatment approaches are argued over, and collaborations form. The breadth of disciplines in one room is part of what makes the meeting influential.

Education runs throughout the year, not just at the annual meeting. TOS offers webinars, workshops, grand rounds, and a library of on-demand content for members who want to keep current. It produces a podcast, Dialogues in Obesity, aimed at professionals. There are awards and grant recognitions that highlight strong work, specialized sections that let members organize around particular interests, and a member directory that supports professional connection. Early-career investigators and students get specific attention through dedicated programming and mentorship, which keeps the field supplied with trained people. The society also runs an Obesity Journal Symposium that puts a spotlight on recently published research and lets authors discuss their findings with peers.

None of this is consumer marketing, and that is the point worth making for a business directory. The Obesity Society does not run a diet plan, sell supplements, or court patients directly. Its outputs are journals, conferences, position statements, and trained clinicians. When a person reads accurate obesity information from a hospital or a government site, there is a good chance the underlying evidence passed through the kind of peer review and scientific debate that TOS organizes. That upstream role is why a curated directory of weight and obesity resources includes the society even though most members of the public will never attend ObesityWeek.

TOS also weighs in on policy, but from a scientific footing. It issues statements on questions such as how obesity should be defined and classified as a disease, how treatments should be evaluated, and what the evidence says about emerging therapies. Because these statements come from the professional body itself, they carry weight with clinicians, regulators, and insurers. For someone trying to judge whether a claim about a new weight treatment is credible, a TOS position statement is a sober place to check.

The organization is structured as a membership society and is transparent about its governance, with its nonprofit filings available through the usual public channels. It is led by an elected slate of officers and a board drawn from its own membership, so the people setting direction are practicing scientists and clinicians rather than outside administrators. It connects internationally as well, taking part in the global network of obesity organizations, which keeps American research in conversation with work being done elsewhere. This outward orientation matters in a field where data from many populations sharpens the conclusions, since findings that hold across different groups tend to be the ones that change clinical practice.

For contact, the headquarters sits at 9211 Corporate Boulevard, Suite 250, in Rockville, Maryland, ZIP 20850. The main phone line is (301) 563-6526, and the society publishes a general email along with specialized contacts for membership, education programs, and journal questions. The website carries information on joining, on the journals, on ObesityWeek, and on the educational catalog.

Placed in a business directory of obesity and weight-management organizations, The Obesity Society represents the scientific and professional layer that sits beneath the patient-facing world. It is where the research is vetted and the clinicians are trained, and its journals and meetings shape what eventually becomes accepted practice. A reader who wants to understand the field at its source, rather than through a commercial program, will find in TOS the body that the experts themselves belong to.

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