Phone-based interventions to control gestational weight gain: a systematic review on features and effects

Objective: The aim of this study was to summarize the evidence regarding the effects and the features of phone-based interventions to control gestational weight gain (GWG).Methods: We included studies that evaluated the effects of phone-based interventions on controlling GWG. The characteristics of studies, effects, and features of interventions were extracted.Results: A total of 12 studies met the inclusion criteria. Outcomes were categorized into three groups (GWG control, proportion of women returning to pre-pregnancy weight, and proportion of women who exceeded the Institute of Medicine recommendations for GWG). Although most studies (66%) showed a statistically significant positive effect of phone-based interventions on the GWG control, the effects on the other outcome categories were found to be inconsistent. While the included studies used phone call and short messaging service (SMS), no study used the other functions of telephones and mobile phones such as video call, internet access, social networks, and smartphone applications. Regarding the functionalities, phone calls were used to provide guidance for healthy weight gain and communication with healthcare providers. SMS provided reminders, educational materials, and guidance.Conclusion: Phone-based interventions can help pregnant women control GWG by providing guidance, reminders, and educational materials. When these interventions use multiple functionalities, they are more effective in controlling GWG.