Obesity — LLMpedia

Obesity
Name	Obesity
Field	Endocrinology, Public health, Nutrition
Symptoms	Excess adiposity, increased body mass
Complications	Type 2 diabetes, cardiovascular disease, osteoarthritis, certain cancers
Onset	Chronic
Duration	Long term
Causes	Multifactorial
Diagnosis	Body mass index, waist circumference
Treatment	Lifestyle modification, pharmacotherapy, surgery

Contents

Obesity

Obesity is a chronic condition characterized by excessive adipose tissue accumulation associated with increased morbidity and mortality. It is studied across World Health Organization, National Institutes of Health, Centers for Disease Control and Prevention, European Commission, and major academic centers such as Harvard University, University of Oxford, Stanford University and Johns Hopkins University. Clinical, public health, and policy responses involve organizations including American Medical Association, Royal College of Physicians, NHS England, Pan American Health Organization, and initiatives like Healthy People.

Definition and Classification

Body mass index (BMI) is the most widely used metric for classification by agencies such as World Health Organization, International Diabetes Federation, and American Heart Association; thresholds (BMI ≥30 kg/m2) define categories used in Global Burden of Disease studies. Alternative measures include waist circumference endorsed by European Society of Cardiology, waist-to-hip ratio referenced by World Heart Federation, and body composition assessed in research at Mayo Clinic, Cleveland Clinic, and Karolinska Institutet. Pediatric classification follows growth charts from World Health Organization and Centers for Disease Control and Prevention while geriatric assessment is discussed in guidance from British Geriatrics Society.

Etiology is multifactorial, integrating genetic predisposition described in studies from Wellcome Trust, Broad Institute, European Molecular Biology Laboratory, and loci identified by consortia such as the GIANT consortium; monogenic forms reported at Institut Pasteur and National Human Genome Research Institute. Environmental drivers include food systems analyzed by Food and Agriculture Organization and United Nations Environment Programme, marketing practices overseen by International Chamber of Commerce, and built environments studied by Urban Institute and World Resources Institute. Behavioral factors are examined in work from American Psychological Association and Royal Society of Public Health, while social determinants are addressed by UNICEF, World Bank, and Bill & Melinda Gates Foundation programs. Medical contributors include medications compiled by European Medicines Agency and U.S. Food and Drug Administration and endocrinopathies recognized by Endocrine Society guidelines.

Adipose dysfunction, chronic inflammation, insulin resistance, and neuroendocrine signaling have been elucidated by researchers at Salk Institute, Max Planck Society, Institut Pasteur, and university centers like Yale University. Complications encompass metabolic syndrome studied in cohorts such as Framingham Heart Study and Nurses' Health Study; cardiovascular outcomes researched by American College of Cardiology and European Society of Cardiology; oncologic associations reported in analyses by International Agency for Research on Cancer and American Cancer Society; musculoskeletal burdens reviewed by American Academy of Orthopaedic Surgeons and Arthritis Foundation; and mental health comorbidities discussed by World Psychiatric Association and American Psychiatric Association.

Clinical practice guidelines from National Institute for Health and Care Excellence, U.S. Preventive Services Task Force, American Academy of Pediatrics, and Endocrine Society recommend BMI measurement, waist circumference, and assessment of comorbidities. Screening programs and health checks appear in systems like NHS Health Check, workplace wellness initiatives evaluated by Occupational Safety and Health Administration, and population screening trials published in JAMA and Annals of Internal Medicine. Diagnostic imaging and metabolic testing are offered at tertiary centers including Massachusetts General Hospital and Mount Sinai Health System.

Population-level strategies promoted by World Health Organization, UNICEF, World Bank, and OECD include fiscal measures (taxation examples from Mexico, United Kingdom, South Africa), front-of-pack labeling adopted by Chile, Australia, and European Union member states, and school-based programs piloted by UNESCO and Centers for Disease Control and Prevention. Urban planning and active transport initiatives have been advanced by UN-Habitat, Institute for Transportation and Development Policy, and local governments such as City of New York and City of Copenhagen. Community interventions and faith-based partnerships involve organizations like Red Cross and Salvation Army.

Clinical management integrates lifestyle interventions from programs at Duke University, Diabetes Prevention Program, and Look AHEAD trial centers; pharmacotherapy overseen by U.S. Food and Drug Administration, European Medicines Agency, and manufacturers such as Novo Nordisk, Eli Lilly and Company, and AstraZeneca; and bariatric surgery practised in institutions like Cleveland Clinic, Johns Hopkins Hospital, and Imperial College Healthcare NHS Trust. Multidisciplinary care models are advocated by World Health Organization, American Society for Metabolic and Bariatric Surgery, and International Federation for the Surgery of Obesity and Metabolic Disorders with rehabilitation and long-term follow-up protocols influenced by Royal Australasian College of Surgeons and Canadian Obesity Network.

Category:Health conditions