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Background There are limited systematic reviews exploring the use of social media for recruiting participants specifically for nutrition, physical activity, and obesity related studies. Objective To conduct a systematic review on the effectiveness of using social media (Facebook, Instagram, and Twitter) for recruiting healthy participants in nutrition, physical activity, or obesity related studies. Design Studies were identified from five databases and included if they reported the number of participants recruited by social media (Facebook, Instagram, or Twitter) vs traditional (printed, email, etc.). The effectiveness of recruitment was compared between methods by study procedures (in-person vs online procedures). The cost-effectiveness of methods was also explored. The protocol was published in the Prospero database (ID# CRD42020204414). Results Twenty-six studies were included. Among studies with both types of recruitment methods, 49% of the sample was reached through traditional methods, 40% through social media, and the rest by other methods. For in-person study procedures, the median number of participants recruited using social media was 19 (range 3-278) and for online study procedures, it was 298 (range 3-17,069). Median recruitment cost using social media (n = 14 studies) was ${\$}$11.9 (range ${\$}$0-517) per participant while this varied considerably for traditional methods depending on how it was calculated (${\$}$214, ${\$}$18.9-${\$}$777). The ratio of participants reached vs recruited was 0.12%; the overall ratio of participants interactions vs recruited was 21.2%. Conclusion For in-person study procedures, traditional recruitment methods were more effective than social media but for online study procedures, about half reported that social media was more effective. While more potential participants were reached through social media, only 21.2% of those who interacted with ads were enrolled. With the increased use of social media, their use for recruitment may be more frequent; therefore, future reviews may show different results.

OBJECTIVES: To conduct a systematic review of facilitators and barriers for children's participation in nutrition, physical activity, and obesity interventions from the perspective of parents, children, and researchers. METHODS: Studies were identified from 5 databases and restricted to children 2–18 years and to English. Studies without results on facilitator and barriers of recruitment were excluded. RESULTS: 423 records were identified; 97 duplicates and 269 unrelated records were initially excluded; 60 records were reviewed for full-text and subsequently 26 were excluded, for a total of 34 included studies. The top four barriers reported by children and parents were time constraints, nature of the intervention, limited understanding of clinical trial information or complexity of consent/trial info, and cost, while for researchers reported barriers were lack of transportation/lack of or childcare and time constraints. The top four common facilitators reported by children and parents were benefit others (altruism) and themselves, compensation/incentives, nature of the intervention, and quality of life, while for researchers these were physician recommendations/referrals, benefits to others and themselves, simple and clear materials describing the study and the inclusion criteria, and compensation/incentives. CONCLUSIONS: These barriers and facilitators should be addressed in future studies to assist in the successful recruitment of children into nutrition, physical activity, and obesity interventions. FUNDING SOURCES: Funding was supported by the National Institute of Health (Eunice Kennedy Shriver National Institute of Child Health and Human Development, NICHD), grant number 1R01HD098589-01.

Objectives: low vitamin D during pregnancy is common and could adversely affect health outcomes. This study evaluated vitamin D status during pregnancy and early in life, and its association with glucose metabolism. Methods: maternal serum 25(OH)D, glucose, and insulin levels were measured longitudinally during pregnancy in Hispanic women with overweight/obesity (n = 31) and their infants at birth and 4 months. Results: insulin and HOMA-IR levels were higher among women with vitamin D below adequate levels compared to those with adequate levels in pregnancy (p0.05). Late in pregnancy, as vitamin D increased by one unit (ng/mL), insulin decreased by 0.44 units and HOMA-IR by 0.09 units. Maternal vitamin D late in pregnancy was correlated with infant vitamin D levels at birth (r = 0.89; p0.01) and 4 months (r = 0.9; p = 0.04), and with glucose (r = 0.79; p = 0.03) and insulin (r = 0.83; p = 0.04) at 4 months. Conclusion: maternal vitamin D status was associated with maternal and infant glucose metabolism in this sample.Objetivos: un bajo nivel de vitamina D durante el embarazo es común y puede tener consecuencias adversas en la salud. Este estudio evaluó el nivel de vitamina D en mujeres embarazadas y sus bebés, así como su asociación con los marcadores de glucosa. Métodos: los niveles séricos de 25(OH)D, glucosa e insulina se midieron longitudinalmente en mujeres embarazadas hispanoamericanas con sobrepeso/obesidad (n = 31) y en sus bebés, desde el nacimiento hasta los 4 meses de edad, en Puerto Rico. Resultados: los niveles maternos de insulina y HOMA-IR eran mayores en las mujeres con niveles de vitamina D por debajo de lo considerado adecuado, comparado con aquellas con niveles adecuados durante todo el embarazo (p0,05). Al final del embarazo, a medida que los niveles de vitamina D aumentaron, por cada unidad (ng/mL) de aumento, la insulina disminuyo en 0,44 unidades y el HOMA-IR en 0,09 unidades. El nivel de vitamina D al final del embarazo se correlacionó con los niveles del bebé al nacer (r = 0,89; p0,01) y a los 4 meses (r = 0,9; p = 0,04), y con los niveles de glucosa (r = 0,79; p = 0,03) e insulina (r = 0,83; p = 0,04) a los 4 meses. Conclusión: el nivel materno de vitamina D se asoció con los marcadores maternos e infantiles de glucosa en esta muestra.

Calcium intake is critical for adequate bone mineralization in adolescence, but it is usually inadequate in US adolescents. A strategy to maximize bone mineralization is to increase calcium absorption, which could be achieved by soluble corn fiber (SCF). There are no studies determining the long-term effects of SCF on bone mass in children. Objectives To determine the effect of one-year SCF supplementation compared to placebo on bone mass and bone biomarkers in children with low habitual calcium intake. We hypothesize that SCF supplementation will result in a higher bone mineral content and higher levels of bone formation and lower bone resorption biomarkers. Methods 240 healthy children (10–13 years), with usual low calcium intake, will be randomized to four experimental groups for 1 year: (1) SCF (12 g/d); (2) SCF (12 g/d) + 600 mg/d of calcium; (3) Placebo (maltodextrin); and (4) Placebo +600 mg/d of calcium. The supplements have been pre-mixed with a flavored powder beverage and participants will only need to dilute it in water and drink this twice per day. Bone will be measured using dual energy x-ray absorptiometry (DXA) at baseline, 6 and 12 months. Serum bone biomarkers will be measured at baseline and at 12 months. Conclusions If supplementing diets with SCF lead to higher bone mass during adolescence, this could help achieve the genetic potential for PBM and to start adult life with stronger bones. If successful, SCF can be incorporated into diets for promoting bone health in adolescents.

Objective: To pilot test the effectiveness of &ldquo, MyNutriCart&rdquo, a smartphone application (app) that generates healthy grocery lists, on diet and weight. Methods: A pilot randomized trial was conducted to test the efficacy of using the &ldquo, app compared to one face-to-face counseling session (Traditional group) in Hispanic overweight and obese adults. Household food purchasing behavior, three 24-h food recalls, Tucker&rsquo, s semi-quantitative food frequency questionnaire (FFQ), and weight were assessed at baseline and after 8 weeks. Statistical analyses included t tests, a Poisson regression model, and analysis of covariance (ANCOVA) using STATA. Results: 24 participants in the Traditional group and 27 in the App group completed the study. Most participants were women (&gt, 88%), with a mean age of 35.3 years, more than a high school education (&gt, 80%), a family composition of at least three members, and a mean baseline body mass index (BMI) of 34.5 kg/m2. There were significant improvements in household purchasing of vegetables and whole grains, in individual intakes of refined grains, healthy proteins, whole-fat dairies, legumes, 100% fruit juices, and sweets and snacks, and in the individual frequency of intake of fruits and cold cuts/cured meats within the intervention group (p &lt, 0.05). However, no significant differences were found between groups. No changes were detected in weight. Conclusions: &ldquo, app use led to significant improvements in food-related behaviors compared to baseline, with no significant differences when compared to the Traditional group. Cost and resource savings of using the app compared to face-to-face counseling may make it a good option for interventionists.

Background Approximately 47% of adults in the United States have periodontal disease. Dietary guidelines recommend a diet providing adequate fiber. Healthier dietary habits, particularly an increased fiber intake, may contribute to periodontal disease prevention. Objective Our objective was to evaluate the relation of dietary fiber intake and its sources with periodontal disease in the US adult population (≥30 y of age). Methods Data from 6052 adults participating in NHANES 2009-2012 were used. Periodontal disease was defined (according to the CDC/American Academy of Periodontology) as severe, moderate, mild, and none. Intake was assessed by 24-h dietary recalls. The relation between periodontal disease and dietary fiber, whole-grain, and fruit and vegetable intakes were evaluated by using multivariate models, adjusting for sociodemographic characteristics and dentition status. Results In the multivariate logistic model, the lowest quartile of dietary fiber was associated with moderate-severe periodontitis (compared with mild-none) compared with the highest dietary fiber intake quartile (OR: 1.30; 95% CI: 1.00, 1.69). In the multivariate multinomial logistic model, intake in the lowest quartile of dietary fiber was associated with higher severity of periodontitis than dietary fiber intake in the highest quartile (OR: 1.27; 95% CI: 1.00, 1.62). In the adjusted logistic model, whole-grain intake was not associated with moderate-severe periodontitis. However, in the adjusted multinomial logistic model, adults consuming whole grains in the lowest quartile were more likely to have more severe periodontal disease than were adults consuming whole grains in the highest quartile (OR: 1.32; 95% CI: 1.08, 1.62). In fully adjusted logistic and multinomial logistic models, fruit and vegetable intake was not significantly associated with periodontitis. Conclusions We found an inverse relation between dietary fiber intake and periodontal disease among US adults ≥30 y old. Periodontal disease was associated with low whole-grain intake but not with low fruit and vegetable intake.