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This trend has important implications for asthma: individuals with obesity have a 30\u201350% higher risk of developing asthma, and obesity is highly prevalent among people with established disease. Mean body mass index in clinical trials and registries of adults with asthma consistently ranges from 28 kg\u00b7m\n                    <jats:sup>\u22122<\/jats:sup>\n                    to 30\u2005kg\u00b7m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , with up to 70% of patients being overweight or obese. These numbers highlight obesity as one of the most common comorbidities in asthma, consistently associated with poorer asthma control and a higher risk of exacerbations. Although obesity-associated asthma is often described as type-2 (T2)-low phenotype, it is increasingly recognised as a heterogeneous condition not restricted to a single phenotype. Excess adiposity influences asthma through multiple mechanisms, including dysregulated adipokine signalling, impaired innate lymphoid cells type 2 (ILC2)\u2013eosinophil\u2013macrophage cross-talk in adipose tissue, systemic low-grade inflammation, metabolic dysfunction, and mechanical effects on lung volumes. This diversity complicates diagnosis, endotyping, and treatment stratification. Obesity should therefore be considered a treatable trait in asthma. Weight reduction (through lifestyle interventions, pharmacotherapy or bariatric surgery) improves symptoms, lung function, and exacerbation risk across both T2-high and T2-low asthma. Importantly, patients with obesity experience similar reductions in exacerbations with anti-T2 biologics as their lean counterparts, though improvements in symptoms and lung function are variable. Future research should prioritise randomised, placebo-controlled trials evaluating glucagon-like peptide (GLP)-1 and dual GLP-1\/glucose-dependent insulinotropic polypeptide (GIP)-agonist therapies specifically in patients with asthma and obesity, and elucidate how obesity modifies inflammatory endotypes and treatment responses.\n                  <\/jats:p>","DOI":"10.1183\/13993003.02687-2025","type":"journal-article","created":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T16:35:17Z","timestamp":1771518917000},"page":"2502687","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Obesity and asthma: obesity causes and aggravates asthma across the entire type-2 inflammation 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