Obesity is one of the defining public health challenges of the twenty-first century. Once concentrated in high-income nations, it now affects populations across all income levels and regions, contributing substantially to cardiovascular disease, diabetes, cancer, and musculoskeletal disorders.

This episode examines:

• Global trends and epidemiological transition• Body mass index (BMI) and its limitations• Biological regulation of appetite and metabolism• Energy balance and environmental drivers• The role of ultra-processed foods• Urban design and physical inactivity• Social gradients and food insecurity• Childhood obesity and life-course risk• Policy interventions - taxation, marketing regulation, reformulation

Obesity cannot be reduced to individual willpower. It reflects an obesogenic environment in which calorie-dense foods are cheap, heavily marketed, and structurally embedded in daily life, while opportunities for physical activity may be constrained by design.

The episode explores the interaction between genetics, behaviour, environment, and socioeconomic inequality. It also addresses the tension between public health messaging and stigma - recognising the ethical imperative to promote health without reinforcing discrimination.

Prevention requires structural change as much as behavioural support.

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Key Takeaways

• Obesity is a global and growing public health issue• It significantly increases risk for multiple chronic diseases• Environmental and policy determinants strongly influence prevalence• Childhood obesity predicts adult morbidity• Structural interventions are often more effective than individual advice alone• Stigma undermines effective public health approaches• Prevention must operate across the life course

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