RESUMO
The history of research on gestational weight gain (GWG) in the United States and United Kingdom provides a context for current clinical practice. We trace the evolution of research on GWG in scientific literature from the 19th century to the present and examine its implications for contemporary clinical and public health practice. Obstetricians, beginning in the late 1800s, recommended dieting during pregnancy in order to limit GWG to 20 lb or less, driven by a belief that excessive weight gain was a cause of toxemia. Beginning in the 1930s, a burgeoning focus on nutrition and health allowed a better understanding of the effect of GWG on the health of the fetus and the newborn. Increased awareness of disparities in infant mortality in the 1960s, followed by systematic review of the literature, produced further refinements in GWG recommendations in the 1970s, which continue today. Current research focuses on epigenetic influences over the life course and has emphasized individualized recommendations. The complex historical perspective that this article provides serves as a reminder of both the interplay and the gaps between research and practice. These gaps result from the fact that clinical guidelines often reflect a specific point in a perpetually evolving state of knowledge that is influenced not only by advances in bench research, but also by refinements in statistical and epidemiologic methods, as well as by the political realities of the time in which they are drafted. IMPORTANCE: Gestational weight gain and its relationship to maternal, fetal, and infant health are areas of active inquiry. OBJECTIVE: We critically review evolution of scientific understanding of GWG from the 19th century to the present, and examine its implications for contemporary obstetric practice. EVIDENCE ACQUISITION: We reviewed all English-language medical studies related to GWG published through 1930s as well as widely cited influential works from 1940s through present time. RESULTS: During the past century, recommendations for GWG have reversed from emphasizing dieting during pregnancy to the importance of proper nutrition during pregnancy. Obstetricians' focus has also evolved from being exclusively on the newborn to include the health of mothers. Contemporary obstetric practice seeks to achieve a balance between mothers' and infants' risk of adverse outcomes. CONCLUSIONS: Historical and social contexts of the United States and the United Kingdom led to distinct GWG policies in the 2 countries. Changes in GWG recommendations over the past century reflect developments in the allied fields, such as epidemiology and nutrition, as much as progress in obstetrics and gynecology. RELEVANCE: The complex historical perspective that this article provides serves as a reminder of both the interplay and the gaps between research and practice. These gaps result from the fact that clinical guidelines often reflect a specific point in a perpetually evolving state of knowledge that is influenced not only by advances in bench research, but also by refinements in statistical and epidemiologic methods, as well as by the political realities of the time in which they are drafted.
