RESUMO
In this introduction to the special issue on business model innovation (BMI) among social purpose organizations (SPOs), we define business models, BMI, and SPOs, and introduce the insights that papers in this special issue contribute to scholarly knowledge at the intersection of SPOs and BMI. We aggregate insights from articles in the special issue to provide insights into the major antecedents of BMI (environmental turbulence, and internal drivers), the substance of BMI (collaboration, managing tensions, and developing dynamic and learning capabilities), and the outcomes of BMI (expansion of dual social-economic goals, and organizational survival). Reflecting on this collection of papers, and the broader social sector literature, we then suggest several avenues for future research.
RESUMO
This study collates existing evidence regarding weight loss among overweight but otherwise healthy adults who use commercial weight-loss programs. Systematic search of 3 databases identified 11 randomized controlled trials and 14 observational studies of commercial meal-replacement, calorie-counting, or pre-packaged meal programs which met inclusion criteria. In meta-analysis using intention-to-treat data, 57 percent of individuals who commenced a commercial weight program lost less than 5 percent of their initial body weight. One in two (49%) studies reported attrition ≥30 percent. A second meta-analysis found that 37 percent of program completers lost less than 5 percent of initial body weight. We conclude that commercial weight-loss programs frequently fail to produce modest but clinically meaningful weight loss with high rates of attrition suggesting that many consumers find dietary changes required by these programs unsustainable.