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Background and aim: The health implications of BMI and MetS in lactating women are significant. This study aims to investigate the relationship between risk of Mets in lactation and BMI in four stages: pre-pregnancy, prenatal period, 42 days postpartum, and current lactation. Methods and results: A total of 1870 Lactating Women within 2 years after delivery were included from "China Child and Lactating Mother Nutrition Health Surveillance (2016–2017)". Logistic regression model and Restricted cubic spline (RCS) were used to estimate the relationship between BMI and risk of MetS. ROC analysis was used to determine the threshold for the risk of MetS. Chain mediating effect analysis was used to verify the mediating effect. BMI of MetS group in all stages were higher than non-MetS group (P < 0.0001). There were significant positive correlations between BMI in each stage and ORs of MetS during lactation (P < 0.05). The best cut-off values for BMI in the four stages were 23.47, 30.49, 26.04 and 25.47 kg/m2. The non-linear spline test at BMI in 42 days postpartum, current and MetS in lactation was statistically significant (P non-linear = 0.0223, 0.0003). The mediation effect of all chains have to work through lactation BMI. The total indirect effect accounted for 80.95% of the total effect. Conclusions: The risk of MetS in lactating women is due to a high BMI base before pregnancy and postpartum. High BMI in all stages of pregnancy and postpartum were risk factors for MetS in lactation. BMI during lactation plays a key role in the risk of MetS. [ABSTRACT FROM AUTHOR]

Abstract: Iron doped g-C3N4 materials were prepared via impregnation of melamine into iron nitrate nonahydrate (Fe(NO3)3·9H2O) solution, evaporation, and subsequent simple thermal condensation. X-ray diffraction (XRD) results showed that iron was well dispersed in the structure of g-C3N4 composite without changing the graphitic stacking structures. Slight structure defects were observed by using field emission scanning electron microscopy (FESEM), which can be ascribed to the aggregation caused by the addition of catalyzed iron. By using UV–vis diffuse reflectance spectroscopy (DRS), enhanced adsorption of light in the region of 450–700nm was observed, which led to the improved photocatalytic degradation of RhB (Rhodamine B) under visible light irradiation. 99.5% of RhB was degraded within 2h by using the most effective catalyst with the Fe/g-C3N4 moral ratio value of 0.02. However, pure g-C3N4 was 68.5%, and commercial titanium catalyst P25 was only 29.2%. [Copyright &y& Elsevier]