Systematic evidence and gap map of research linking food security and nutrition to mental health
Abstract Connections between food security and nutrition (FSN) and mental health have been analytically investigated, but conclusions are difficult to draw given the breadth of literature. Furthermore, there is little guidance for continued research. We searched three databases for analytical studies linking FSN to mental health. Out of 30,896 records, we characterized and mapped 1945 studies onto an interactive Evidence and Gap Map (EGM). Anthropometry (especially BMI) and diets were most linked to mental health (predominantly depression). There were fewer studies on infant and young child feeding, birth outcomes and nutrient biomarkers related to anxiety, stress and mental wellbeing. Two-thirds of studies hypothesized FSN measures as the ‘exposure’ influencing mental health outcomes. Studies were overwhelmingly observational, followed by systematic reviews. One-third of studies were from low- and middle-income countries. This map visualizes the extent and nature of analytical studies relating FSN to mental health, guides further research, and solidifies strategic planning.