Systematic evidence and gap map of research linking food security and nutrition to mental health.

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). In these studies, 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 well-being. Two-thirds of studies hypothesized FSN measures as the exposure influencing mental health outcomes. Most studies were observational, followed by systematic reviews as the next largest category of study. One-third of studies were carried out in low- and middle-income countries. This map visualizes the extent and nature of analytical studies relating FSN to mental health and may be useful in guiding future research.

Global Mental Health and Nutrition: Moving Toward a Convergent Research Agenda.

Both malnutrition and poor mental health are leading sources of global mortality, disease, and disability. The fields of global food security and nutrition (FSN) and mental health have historically been seen as separate fields of research. Each have undergone substantial transformation, especially from clinical, primary care orientations to wider, sociopolitical approaches to achieve Sustainable Development Goals. In recent years, the trajectories of research on mental health and FSN are further evolving into an intersection of evidence. FSN impacts mental health through various pathways such as food insecurity and nutrients important for neurotransmission. Mental health drives FSN outcomes, for example through loss of motivation and caregiving capacities. They are also linked through a complex and interrelated set of determinants. However, the heterogeneity of the evidence base limits inferences about these important dynamics. Furthermore, interdisciplinary projects and programmes are gaining ground in methodology and impact, but further guidance in integration is much needed. An evidence-driven conceptual framework should inform hypothesis testing and programme implementation. The intersection of mental health and FSN can be an opportunity to invest holistically in advancing thinking in both fields.

Maternal mental health symptoms are positively associated with child dietary diversity and meal frequency but not nutritional status in Eastern Democratic Republic of Congo.

OBJECTIVE: The objective was to examine the association between symptoms of maternal mental health problems and child diet and nutritional status in South Kivu, Democratic Republic of Congo. DESIGN: Maternal depression and anxiety symptoms were measured by the Hopkins Symptom Checklist-25 (HSCL-25), and post-traumatic stress was measured by the Harvard Trauma Questionnaire (HTQ). Participants were classified as having high psychological distress if their mean item score was in the upper quartile of both measures. Dependent variables included child dietary diversity, meal frequency, height-for-age z score (HAZ), weight-for-age z score (WAZ), weight-for-height z score (WHZ), stunting and underweight. Bivariate and multivariate regression analyses were conducted. SETTING: The study was nested in a larger quasi-experimental study evaluating Jenga Jamaa II, a food and nutrition assistance project in Uvira and Fizi territories. PARTICIPANTS: In total, 812 mother-child pairs participated. Children ranged from 2·6 to 5·6 years of age. RESULTS: HSCL-25 (ß: 0·18, P < 0·05) and HTQ (ß: 0·19, P < 0·05) were statistically significantly associated with higher dietary diversity scores, and all maternal mental health measures were associated with higher meal frequency (HSCL-25: ß: 0·13, P = 0·001; HTQ: ß: 0·12, P = 0·001; high distress: ß: 0·15, P < 0·05) and consumption of at least three meals/snacks per day (HSCL-25: OR: 2·06, HTQ: OR: 1·93, high distress: OR: 2·68, P < 0·001 for all). No significant associations were found with HAZ, WAZ, WHZ, stunting or underweight indicators. CONCLUSIONS: More severe symptoms of maternal mental health problems were positively associated with child diet, but not anthropometry indicators. More research is needed to understand the role of maternal mental health in child feeding practices in food insecure and resource-poor settings.

Mental health symptoms and their relations with dietary diversity and nutritional status among mothers of young children in eastern Democratic Republic of the Congo.

BACKGROUND: In developing countries, maternal mental health problems have been linked to sub-optimal child feeding practices and child underweight and stunting, but little is known about how maternal mental health is associated with mothers' own diets and nutritional status. The objective of the study was to investigate the association between mental health symptoms and diet and nutritional status of mothers of young children in South Kivu, DR Congo. METHODS: Participants were 828 mothers of young children enrolled in a larger, quasi-experimental study evaluating a multi-year food security and nutrition project. The present analysis was conducted with cross-sectional data collected from 2015 to 2016. We assessed symptoms of anxiety and depression using the Hopkins Symptom Checklist-25 (HSCL-25) and post-traumatic stress disorder (PTSD) with the Harvard Trauma Questionnaire (HTQ), using a four-point Likert scale. Mean scale scores were calculated ranging from one to four. A variable was created for high distress (participants scoring in the upper quartile of both measures). Dietary diversity scores were calculated from the number of food groups (range zero to ten) consumed the previous day, identified from an open recall. Nutritional status was measured by body mass index (BMI) and underweight (BMI < 18.5 kg/m2, or mid-upper arm circumference < 23 cm for pregnant women). Bivariate and multivariate (adjusting for parent study intervention group, education, age, health, parity, livelihoods zone, and territory of origin) regression analyses were conducted. RESULTS: Maternal mental health measures were positively and statistically significantly associated with higher dietary diversity scores in adjusted analyses (HSCL-25: ß= 0.18, p = 0.002, HTQ: ß= 0.12, p = 0.029, High Distress: ß= 0.47, p < 0.001). Mental health symptoms were not significantly associated with BMI (HSCL-25: ß = - 0.04, p = 0.824; HTQ: ß = 0.02, p = 0.913; High distress: ß= - 0.02, p = 0.938) or underweight (HSCL 25: OR = 0.91, p = 0.640; HTQ: OR = 1.03, p = 0.866; High distress: OR = 0.78, p = 0.489). CONCLUSIONS: More severe maternal mental health symptoms were associated with higher dietary diversity but not nutritional status, and the reasons for these findings are not clear from available data. More research is needed to identify underlying factors that could influence mental health symptomatology and diet quality among food insecure and extremely resource-limited populations.

Unexpected Tribological Synergy in Polymer Blend Coatings: Leveraging Phase Separation to Isolate Domain Size Effects and Reduce Friction.

We employed a systematic processing approach to control phase separation in polymer blend thin films and significantly reduce dynamic friction coefficients (µ)s. We leveraged this modulation of phase separation to generate composite surfaces with dynamic friction coefficients that were substantially lower than expected on the basis of simple mixing rules, and in several cases, these friction coefficients were lower than those of both pure components. Using a model polyisoprene [PI]/polystyrene [PS] composite system, a minimum µ was found in films with PS mass fractions between 0.60 and 0.80 (µblend = 0.11 ± 0.03); that value was significantly lower than the friction coefficient of PS (µPS = 0.52 ± 0.01) or PI (µPI = 1.3 ± 0.09) homopolymers and was comparable to the friction coefficient of poly(tetrafluoroethylene) [PTFE] (µPTFE = 0.09 ± 0.01) measured under similar conditions. Additionally, through experiments in which the domain size was systematically varied at constant composition (through an annealing process), we demonstrated that µ decreased with decreasing characteristic domain size. Thus, the tribological synergy between PS and PI domains (discrete size, physical domain isolation, and overall film composition) was shown to play an integral role in the friction and wear of these PS/PI composites. Overall, our results suggest that even high friction polymers can be used to create low friction polymer blends by following appropriate design rules and demonstrate that engineering microstructure is critical for controlling the friction and adhesion properties of composite films for tribologically relevant coatings.

Maternal Psychological Distress and Perceived Impact on Child Feeding Practices in South Kivu, DR Congo.

BACKGROUND: Maternal mental health problems are associated with poor child growth and suboptimal child feeding practices, yet little qualitative research has been conducted to understand mothers' perceptions about how maternal mental ill health and child nutrition are related. OBJECTIVE: The objective of the study was to understand maternal perceptions on sources of psychological distress, and how distress impacts functioning, especially related to childcare and feeding practices among mothers of young children in South Kivu, DR Congo. METHODS: Mothers of young children who were participating in a larger study were eligible. Using purposive sampling, participants were selected if they had high or low levels of psychological distress, based on their mean item score on measures of symptoms of depression, anxiety, and post-traumatic stress. Twenty in-depth interviews and 2 focus group discussions were conducted, with a total of 35 mothers. Key informant interviews were conducted with 5 local health workers. Audio recordings were transcribed and coded, and the analysis was guided by Grounded Theory methodology. RESULTS: Major themes to emerge were that women's husbands were a significant source of distress, with husbands' infidelity, abandonment, and lack of financial support mentioned by participants. Psychological distress resulted in appetite and weight loss, and poor nutritional status made it difficult to breastfeed. Participants perceived psychological distress caused milk insufficiency and difficulty breastfeeding. CONCLUSION: Mothers experiencing psychological distress may need greater support for maternal nutrition and breastfeeding, and engaging fathers through responsible parenting interventions may reduce psychological distress and have a positive impact on child health.

Maternal mental health symptoms are positively related to emotional and restrained eating attitudes in a statewide sample of mothers participating in a supplemental nutrition program for women, infants and young children.

Postpartum, low-income mothers are at risk for mental health symptoms and obesity, and disordered eating attitudes may be associated with both mental health and obesity in this vulnerable population. The study objective is to determine whether higher levels of mental health symptoms are associated with increased odds of emotional and restrained eating attitudes in this sample of Special Supplemental Nutrition Program for Women, Infants and Children (WIC) participants. Data on 711 mothers of infants <13 months from a statewide sample of Maryland WIC participants were collected via telephone survey. Maternal mental health symptoms were measured on continuous scales for depression (PRIME-MD), stress (Perceived Stress Scale) and anxiety (Spielberger State-Trait Anxiety Inventory). Emotional and restrained eating attitudes were measured with questions adapted from the Dutch Eating Behavior Questionnaire. Multivariate logistic regression analysis was used. Obesity [body mass index (BMI) ≥ 30] was explored as a moderating variable. Mothers reporting higher levels of depression symptoms [odds ratio (OR) = 3.93, 95%CI: 2.71-5.69], anxiety symptoms (OR = 1.96, 95%CI: 1.47-2.65), stress symptoms (OR = 2.09, 95%CI: 1.67-2.61) and high overall mental health symptomatology (OR = 3.51, 95%CI: 2.43-5.3) had increased odds of emotional eating attitudes. There were significant associations between symptoms of depression (OR = 1.59, 95% CI: 1.12-2.25) and increased odds of restrained eating attitudes. Obesity did not moderate the association. Mothers with mental health symptoms are at risk for disordered eating attitudes, which may increase risk of poor diet. These findings underscore the need for greater focus on addressing maternal mental health status and eating attitudes in the postpartum period.

A Qualitative Analysis of Barriers and Facilitators to Optimal Breastfeeding and Complementary Feeding Practices in South Kivu, Democratic Republic of Congo.

BACKGROUND: Suboptimal infant and young child feeding (IYCF) practices are determinants of poor child nutritional status. In the Democratic Republic of Congo, few children are fed according to international guidelines; this combined with endemic poverty and food insecurity have contributed to the high prevalence of child undernutrition. OBJECTIVE: To characterize IYCF practices and barriers and enablers to optimal child feeding in South Kivu. METHODS: Focus group discussions, structured and in-depth interviews with women of reproductive age, mothers of children <2 years, and health workers were conducted in 2012 as part of formative research for the US Agency for International Development (USAID)-funded Jenga Jamaa II multiyear assistance program. RESULTS: Although breastfeeding was prevalent, few mothers engaged in optimal feeding practices. Barriers included poverty, high work burden, lack of decision-making power in the household, and perceived milk insufficiency. Health provider guidance and mothers' motivation to breastfeed and feed nutrient-dense foods emerged as facilitators to optimal practices. CONCLUSIONS: Structural factors, especially long hours working in agricultural fields, impeded mothers' ability to feed their children optimally. Interventions to address child nutrition and improve IYCF practices should take into account these factors, in addition to food access, nutrition education, and behavior change.