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[Correspondence] Tackling obesity: challenges ahead

The Lancet Obesity Series 2015 addressed an important public health problem worldwide. However, it adopted a strongly nutritional focus, with limited attention to physical activity, a crucial component of energy balance.1 In order to assess how well physical activity was reflected in the Series, we carried out a bibliometric analysis of word usage across the series and examined the reference lists of each paper. For the bibliometric analysis, we identified specific terms “physical activity“, “exercise“, or “(incidental) activity“, and compared these to “nutr*“, “diet*“, or “food“ mentions in all four Series papers; we counted and coded the papers referenced in each paper; we also examined the most recent 20 publications by each author in PubMed and coded them as physical activity or nutrition focused.