# Medical reclassification of obesity as a chronic disease

> Live situation record from CLSTR: https://clstr.news/situations/20261010-medical-reclassification-of-obesity-as-a-chronic-disease
> Updated: 2026-10-13T17:04:23.000Z. Sources: 13. Developments: 3.

Medical experts and the World Health Organization (WHO) have reclassified obesity as a chronic, complex, and multisystemic metabolic disease rather than a simple lack of willpower. The condition is driven by an interplay of biological, genetic, environmental, social, emotional, and economic factors, including hormonal regulation, sleep patterns, and physical activity levels.

Recent discussions at the 48th Congress of the Spanish Society of Family Physicians (Semergen) emphasize that treatment should shift from simple weight loss toward body recomposition, metabolic regression, and functional recovery. Because the pathophysiology is multisystemic, experts argue that pharmacological approaches must be multi-target. In Spain, approximately 53% of the population—over 24 million people—lives with overweight or obesity.

Efforts to combat stigma are also emerging, such as the ‘Hablar te quita un peso de encima’ campaign in Costa Rica, which encourages professional medical guidance over willpower-based views. This is particularly relevant given that 70.7% of adults in Costa Rica live with overweight or obesity. Globally, obesity prevalence has tripled since 1975, with projections suggesting over half the world’s population may be overweight or obese by 2035.

In childhood obesity management, specialists maintain that the family environment is central to treatment, as children struggle to adopt healthy habits without supportive surroundings. Clinical assessments continue to use Body Mass Index (BMI), though doctors stress it must be interpreted alongside muscle mass and abdominal circumference to mitigate risks such as cardiovascular disease, type 2 diabetes, respiratory issues, sleep apnea, and certain cancers.

## Timeline

### 2026-10-13: Obesity redefined as complex metabolic disease by health experts

Health experts are reframing obesity as a complex metabolic disease rather than a lack of willpower, launching new medical approaches and awareness campaigns in Spain and Costa Rica.

8 sources. https://clstr.news/cluster/obesity-redefined-as-complex-metabolic-disease-by-health-experts

### 2026-10-10: Medical experts define obesity as a complex, multifactorial disease

Medical experts define obesity as a complex, multifactorial disease influenced by genetics, environment, and lifestyle, requiring personalized treatment and supportive family environments.

3 sources. https://clstr.news/cluster/medical-experts-define-obesity-as-a-complex-multifactorial-disease

### 2026-10-07: Obesity recognized as a complex chronic disease

Obesity is recognized by the WHO as a complex chronic disease influenced by genetics, hormones, and environment, rather than just willpower. Experts advise protecting muscle mass during weight loss.

2 sources. https://clstr.news/cluster/obesity-recognized-as-a-complex-chronic-disease-1

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Cite as: Medical reclassification of obesity as a chronic disease. CLSTR, https://clstr.news/situations/20261010-medical-reclassification-of-obesity-as-a-chronic-disease