Seasonality Affects Fluid Intake Behaviors among Young Adults in Hebei, China.

BACKGROUND: Evidence on the association between environmental factors and fluid intake behavior remains limited. The current study aims to explore seasonal variations in fluid intake behaviors among young adults in China. METHODS: A prospective cohort of 79 healthy young adults (43 males and 36 females) aged 19-21 in Hebei, China, was assessed for fluid intake behaviors for four seasons. For each assessment, the participants' anthropometric measurements were collected. Temperature and humidity on survey days were measured. Participants' total drinking fluid (TDF) was recorded using a self-administrative 7 d, 24 h fluid intake questionnaire. To calculate water from food (WFF), we weighed all foods consumed by participants. Duplicates of consumed food samples were collected to measure the water content via the drying method. RESULTS: The mean total water intake (TWI) was 2761 ± 881, 2551 ± 845, 2210 ± 551, and 1989 ± 579 for spring, summer, fall, and winter, respectively (F(2.37) = 42.29, p < 0.001). The volume and proportion of TWI from TDF and WFF varied across the four seasons. The volume of WFF in spring (1361 ± 281, F(2.61) = 17.21, p < 0.001) and TDF in summer (1218 ± 502, F(2.62) = 9.36, p < 0.001) was among the highest, while participants' fluid intake behaviors in spring and summer were less distinct than the other pairwise comparisons. A moderate association was found between outdoor temperature and TDF (r = 0.53, p < 0.01). Different general estimating equations suggested that gender, seasonality, outdoor temperature, differences in indoor and outdoor temperature, and mean temperature were independent factors of TDF. An interactive effect was found for gender and temperature, showing that the expected TDF of males may increase more as the temperature climbs. CONCLUSIONS: Gender, seasonality, and air temperature could significantly affect fluid intake behaviors, including the amount and type of fluid intake. However, the independent effect of BMI and humidity remains unclear.

Exploring the Association between Anxiety, Depression, and Gut Microbiota during Pregnancy: Findings from a Pregnancy Cohort Study in Shijiazhuang, Hebei Province, China.

Negative emotions and gut microbiota during pregnancy both bear significant public health implications. However, the relationship between them has not been fully elucidated. This study, utilizing data from a pregnancy cohort, employed metagenomic sequencing to elucidate the relationship between anxiety, depression, and gut microbiota's diversity, composition, species, and functional pathways. Data from 87 subjects, spanning 225 time points across early, mid, and late pregnancy, were analyzed. The results revealed that anxiety and depression significantly corresponded to lower alpha diversity (including the Shannon entropy and the Simpson index). Anxiety and depression scores, along with categorical distinctions of anxiety/non-anxiety and depression/non-depression, were found to account for 0.723%, 0.731%, 0.651%, and 0.810% of the variance in gut-microbiota composition (p = 0.001), respectively. Increased anxiety was significantly positively associated with the abundance of Oscillibacter sp. KLE 1745, Oscillibacter sp. PEA192, Oscillibacter sp. KLE 1728, Oscillospiraceae bacterium VE202 24, and Treponema socranskii. A similar association was significantly noted for Oscillibacter sp. KLE 1745 with elevated depression scores. While EC.3.5.3.1: arginase appeared to be higher in the anxious group than in the non-anxious group, vitamin B12-related enzymes appeared to be lower in the depression group than in the non-depression group. The changes were found to be not statistically significant after post-multiple comparison adjustment.

A Study of Fluid Intake, Hydration Status, and Body Composition of Pregnant Women in Their Third Trimester, and Relationships with Their Infant's Birth Weight in China: A Prospective Cohort Study.

BACKGROUND: Water intake and hydration status may potentially influence maternal and child health. However, there is little research regarding this topic. OBJECTIVES: This study aimed to investigate pregnant women's total fluid intake (TFI) levels, hydration status, and body composition and further explore their relationship with infant birth weight. METHODS: A 7-day, 24 h fluid intake recorded was applied to determine participants' TFI levels. Morning urine samples were collected and tested to evaluate their hydration status. Maternal body compositions in their third trimester and infant birth weights were measured. RESULTS: A total of 380 participants completed the study. The TFI was insufficient for pregnant women during their third trimester (median = 1574 mL), with only 12.1% of participants meeting the recommended adequate fluid intake level for pregnant women living in China (1.7 L per day). With the increasing TFI values, the urine osmolality decreased, which showed statistical significance among the four groups (χ2 = 22.637, p < 0.05). The participants displayed a poor hydration status. Meanwhile, the percentage of participants who were in dehydrated status decreased (χ2 = 67.618, p < 0.05), while body water content and basal metabolic rate increased with the increase in TFI levels (χ2 = 20.784, p < 0.05; χ2 = 14.026, p < 0.05). There were positive linear relationships between plain water intake, the basal metabolic rate of pregnant women and their infant birth weight (SE = 0.153, p < 0.05; SE = 0.076, p < 0.05). CONCLUSIONS: Water intake was insufficient, and poor hydration status was common among pregnant women in China. There may be potential relationships between plain water intake, basal metabolic rate, and infant birth weight.

The return on investment for the prevention and treatment of childhood and adolescent overweight and obesity in China: a modelling study.

Background: The rapid increase in child and adolescent overweight and obesity (OAO) in China has a significant health and economic impact. This study undertook an investment case analysis to evaluate the health and economic impacts of child and adolescent OAO in China and the potential health and economic returns from implementing specific policies and interventions. Methods: The analysis estimates the reduction in mortality and morbidity from implementing a set of evidence-based interventions across China between 2025 and 2092 using a deterministic Markov cohort model. Modelled interventions were identified by literature review and expert recommendation and include fiscal and regulatory policies, eHealth breastfeeding promotion, school-based interventions, and nutritional counselling by physicians. The study applies a societal costing perspective to model the economic impact on healthcare cost savings, wages, and productivity during adulthood. By projecting and comparing the costs between a status quo scenario and an intervention scenario, the study estimates the return on investment (ROI) for interventions separately and in combination. Findings: Without intervention China will experience 3.3 billion disability-adjusted life years (DALYs) due its current levels of child and adolescent OAO and a lifetime economic impact of CNY 218 trillion (USD 31.6 trillion), or a lifetime CNY 2.5 million loss per affected child or adolescent (USD 350 thousand). National implementation of all five interventions would avert 179.4 million DALYs and result in CNY 13.1 trillion of benefits over the model cohort's lifetime. Implementing fiscal and regulatory policies had the strongest ROI, with benefits accruing at least 10 years after implementation. Scaling up China's current school-based interventions offers China significant health and economic gains, however, the ROI is lower than other modelled interventions. Interpretation: Effective prevention and treatment of child and adolescent OAO is critical to China's health and economic development. Multiple interventions offer a comprehensive approach to address the various factors that increase risk of child and adolescent OAO. Nonetheless, fiscal and regulatory policies offer the strongest health and economic gains. Funding: Funding was provided by UNICEF China.

The association between hydration state and the metabolism of phospholipids and amino acids among young adults: a metabolomic analysis.

Background: Water is vital for humans' survival and general health, which is involved in various metabolic activities. Objectives: The aim of this study was to investigate the variation in urine metabolome and associated metabolic pathways among people with different hydration states. Methods: A metabolomic analysis was conducted using 24-h urine samples collected during a cross-sectional study on fluid intake behavior from December 9 to 11, 2021, in Hebei, China. Subjects were divided into the optimal hydration (OH, ≤500 mOsm/kg, n = 21), middle hydration (500-800 mOsm/kg, n = 33), and hypohydration groups (HH, >800 mOsm/kg, n = 13) based on the 3-d average 24-h urine osmolality. Collected 24-h urine samples from 67 subjects (43 males and 34 females) were analyzed for urine metabolome using liquid chromatography-MS. Results: The untargeted metabolomic analysis yielded 1055 metabolites by peak intensities. Integrating the results of the orthogonal projections to latent structures discriminant analysis and fold change test, 115 differential metabolites between the OH and HH groups, including phospholipids (PLs) and lysophospholipids, were identified. Among the 115 metabolites identified as differential metabolites, 85 were recorded by the Human Metabolome Database and uploaded to the Kyoto Encyclopedia of Genes and Genomes databases for pathway analysis. Twenty-one metabolic pathways were recognized. Phenylalanine metabolism (0.50, P = 0.007), phenylalanine, tyrosine, and tryptophan biosynthesis (0.50, P = 0.051), glycerophospholipid metabolism (0.31, P < 0.001), sphingolipid metabolism (0.27, P = 0.029), and cysteine and methionine metabolism (0.10, P = 0.066) had the leading pathway impacts. Conclusions: We found variations in the urinary PLs and amino acids among subjects with different hydration states. Pathways associated with these differential metabolites could further impact various physiologic and pathologic functions. A more comprehensive and in-depth investigation of the physiologic and pathologic impact of the hydration state and the underlying mechanisms to elucidate and advocate optimal fluid intake habits is needed.This trial was registered at Chinese Clinical Trial Registry as ChiCTR2100045268.

Evaluating Childhood Overweight- and Obesity-Related Food Marketing Policies in China Using the Food-Environment Policy Index (Food-EPI).

OBJECTIVE: Addressing the increasing global health issue of childhood obesity, exacerbated by pervasive food marketing, this study critically evaluated China's food marketing policies in comparison with international best practices, aiming to uncover policy content and implementation gaps and inform policy enhancement strategies. METHOD: Three key indicators were utilized from the Healthy Food-Environment Policy Index (Food-EPI)'s food promotion domain. A panel of experts (n = 13) from academic institutions, China Centers for Disease Control and Prevention, and the food industry assessed the Chinese government's policy scores and implementation levels concerning food marketing. Benchmarked against international best practices using the Food-EPI process, this evaluation encompassed context analysis, data collection, evidence-based policy action, government validation, policy rating, scoring, and results translation for government and stakeholders. The three chosen indicators specifically addressed childhood overweight- and obesity-related food marketing in broadcast media (Indicator 1), non-broadcast media (Indicator 2), and child gathering settings (Indicator 3). RESULTS: Specifically, Indicator 1, the Single Food Marketing Indicator Score was measured at 2.31 ± 0.38, with an accompanying Food Marketing Policy Implementation Percentage of 46.2%, and Low Implementation Level. For non-broadcast mediums (Indicator 2), these metrics were gauged at 1.77 ± 0.27, 35.4%, and Low Implementation Level, respectively. In child gathering settings (Indicator 3), for efforts curbing unhealthy food promotion, a score of 2.77 ± 0.27, an implementation percentage of 55.4%, and Medium Implementation Level was obtained. Cumulatively, the overarching efficacy of food marketing policy enforcement was determined to be suboptimal, with the consolidated figures being Total Food Marketing Score as 2.28 ± 0.97, Total Food Marketing Policy Implementation Percentage as 45.6%, and Total Food Marketing Policy Implementation Level as Low. CONCLUSION: Like many countries, China's food marketing policies and implementation have room for improvement when compared to international best practices. Recommendations include emphasizing nutritional legislation, fostering stakeholder collaboration, bolstering public health campaigns, and leveraging technology for stringent enforcement.

Different Dimensions of the Home Food Environment May Be Associated with the Body Mass Index of Older Adults: A Cross-Sectional Survey Conducted in Beijing, China.

OBJECTIVE: The objective of this study was to evaluate the home food environment of the elderly in Beijing and analyze its association with the body mass index (BMI) of the elderly, as well as to provide recommendations for improving the home food environment for the elderly. METHODS: This study was conducted in Beijing, China, in 2019. The participants were 1764 elderly individuals aged 65 to 80, recruited from 12 communities through a multistage stratified random sampling method. The study involved the use of questionnaire surveys to gather data on participants' demographics, the availability of various foods in their households, and their living conditions. Socioeconomic status (SES) was evaluated based on their educational level, occupation, and income level. Height and weight measurements were taken to calculate BMI. We conducted both univariate analysis and multiple linear regression analysis to evaluate the relationship between the home food environment and BMI. RESULTS: A total of 1800 questionnaires were distributed, of which 1775 were retrieved, resulting in a questionnaire recovery rate of 98.6%. Among these, 1764 questionnaires were deemed valid, corresponding to a questionnaire validity rate of 99.4%. The participants had a mean age of 69.7 ± 4.3 years old, over 40% of whom were overweight or obese. In terms of low-energy/high-nutrient-density foods, the most readily available items were fresh vegetables (95.6%), followed by coarse grains (94.1%), fresh fruits (90.4%), and dairy products (83.6%). Among high-energy/low-nutrient-density foods, preserved foods were the most available (51.9%), followed by salted snacks (40.6%), sugary beverages (28.2%), and fried foods (9.4%). Approximately 7.3% of participants lived alone. Elderly individuals with higher SES had a lower BMI compared to those with medium to low SES (25.9 vs. 26.5, 25.9 vs. 26.4, p < 0.05). Those living alone had a higher BMI than those who did not (27.2 vs. 26.2, p = 0.001). After controlling for potential confounding variables, older adults with high SES exhibited a BMI reduction of 0.356 kg/m2 (p = 0.001), whereas those living alone exhibited an increase in BMI of 1.155 kg/m2 (p < 0.001). The presence of preserved foods at home was linked to a BMI increase of 0.442 kg/m2 (p = 0.008). CONCLUSION: This study underscores the significant impact of family SES, living conditions, and the availability of preserved foods on the BMI of elderly individuals.

Tracking Regulatory Mechanism of Trace Fe on Graphene Electromagnetic Wave Absorption.

Polarization and conductance losses are the fundamental dielectric attenuation mechanisms for graphene-based absorbers, but it is not fully understood in revealing the loss mechanism of affect graphene itself. For the first time, the reduced graphene oxide (RGO) based absorbers are developed with regulatory absorption properties and the absorption mechanism of RGO is mainly originated from the carrier injection behavior of trace metal Fe nanosheets on graphene. Accordingly, the minimum reflection loss (RLmin) of Fe/RGO-2 composite reaches - 53.38 dB (2.45 mm), and the effective absorption bandwidth achieves 7.52 GHz (2.62 mm) with lower filling loading of 2 wt%. Using off-axis electron hologram testing combined with simulation calculation and carrier transport property experiments, we demonstrate here the carrier injection behavior from Fe to graphene at the interface and the induced charge accumulation and rearrangement, resulting in the increased interfacial and dipole polarization and the conductance loss. This work has confirmed that regulating the dielectric property of graphene itself by adding trace metals can not only ensure good impedance matching, but also fully exploit the dielectric loss ability of graphene at low filler content, which opens up an efficient way for designing lightweight absorbers and may be extended to other types materials.

The Amount of Fluid Intake among Pregnant Women in China Increases with Pregnancy Progression: A Prospective Cohort Study.

Fluid intake and hydration status during pregnancy may have influences on maternal and infant health. However, few studies have recorded and analyzed total fluid intake (TFI) levels during the whole pregnancy. This study mainly aimed to investigate the TFI levels of pregnant women in three trimesters, and further to assess their hydration status. The relationships of TFI and hydration status were also analyzed. A convenience sampling method was used to recruit pregnant women from the Haikou Maternity and Child Health Hospital in China in this prospective cohort study. A 7-day 24 h fluid intake questionnaire was used for recording the fluid intake of the participants in their three trimesters. Fasting blood samples and first morning urine samples were also collected and tested. Hydration status was evaluated using urine osmolality. Finally, 142 pregnant women completed the study. The median TFIs in the first, second, and third trimesters were 1336, 1477, and 1584 mL, respectively. The TFI levels increased with pregnancy progression (χ2 = 134.155, p < 0.05). Out of 142 participants, 100.0%, 97.2%, and 85.2% of participants did not reach the recommendation amount for an adequate TFI among Chinese pregnant women in the three trimesters, respectively (χ2 = 29.840, p < 0.05). Plain water was the main source of fluid intake, accounting for 92.0%, 94.2%, and 93.4% of TFI, respectively. The median values of dairy product intake were 61, 57, and 59 mL in the three trimesters. The frequency of participants without an optimal hydration status in the three trimesters was 71.8%, 76.1%, and 83.1%, respectively (χ2 = 29.909, p < 0.05). The participants of each trimester were divided into four groups according to quartiles of TFI, including participants with a lower fluid intake (LFI1 and LFI2) and higher fluid intake (HFI1 and HFI2). As the TFI values increased from the LFI1 group to the HFI2 group, the urine osmolality decreased (all p < 0.05). Moderate-intensity negative correlations were found between urine osmolality, hydration status, and TFI (all p < 0.05). It is suggested that fluid intake strategies should be promoted and health education should be conducted to improve the hydration status of pregnant women.

Hydrothermal Synthesis of MoS2/SnS2 Photocatalysts with Heterogeneous Structures Enhances Photocatalytic Activity.

The use of solar photocatalysts to degrade organic pollutants is not only the most promising and efficient strategy to solve pollution problems today but also helps to alleviate the energy crisis. In this work, MoS2/SnS2 heterogeneous structure catalysts were prepared by a facile hydrothermal method, and the microstructures and morphologies of these catalysts were investigated using XRD, SEM, TEM, BET, XPS and EIS. Eventually, the optimal synthesis conditions of the catalysts were obtained as 180 °C for 14 h, with the molar ratio of molybdenum to tin atoms being 2:1 and the acidity and alkalinity of the solution adjusted by hydrochloric acid. TEM images of the composite catalysts synthesized under these conditions clearly show that the lamellar SnS2 grows on the surface of MoS2 at a smaller size; high-resolution TEM images show lattice stripe distances of 0.68 nm and 0.30 nm for the (002) plane of MoS2 and the (100) plane of SnS2, respectively. Thus, in terms of microstructure, it is confirmed that the MoS2 and SnS2 in the composite catalyst form a tight heterogeneous structure. The degradation efficiency of the best composite catalyst for methylene blue (MB) was 83.0%, which was 8.3 times higher than that of pure MoS2 and 16.6 times higher than that of pure SnS2. After four cycles, the degradation efficiency of the catalyst was 74.7%, indicating a relatively stable catalytic performance. The increase in activity could be attributed to the improved visible light absorption, the increase in active sites introduced at the exposed edges of MoS2 nanoparticles and the construction of heterojunctions opening up photogenerated carrier transfer pathways and effective charge separation and transfer. This unique heterostructure photocatalyst not only has excellent photocatalytic performance but also has good cycling stability, which provides a simple, convenient and low-cost method for the photocatalytic degradation of organic pollutants.

Dynamic changes in gut microbiota during pregnancy among Chinese women and influencing factors: A prospective cohort study.

Gut microbiota (GM) dynamics during pregnancy vary among different populations and are affected by many factors, such as living environments and diet. This study aims to observe and evaluate the changes in the structure and function of the GM from the first to the third trimester of pregnancy in Chinese women, and to explore the main factors affecting the changes in intestinal microecology. Fifty-five Chinese pregnant women were recruited for this study and their fecal samples were collected during the first (P1), second (P2), and third trimesters (P3) of pregnancy. We exploited metagenomic sequencing to compare the composition and function of the GM in different pregnancy periods. Bioinformatic analysis revealed that there were differences in the composition of the GM among P1, P2, and P3, as indicated by the increase in α-diversity and ß-diversity of the GM and the differences in the relative abundances of distinct bacterial phyla. Gestational diabetes mellitus (GDM) was the main factor (P < 0.05) that affected the changes in GM at various stages of pregnancy. There were also disparities in the structure of the GM between the GDM group and non-GDM group in the P1, P2, and P3. The GDM group exhibited increased abundances in Ruminococcus_gnavus, Akkermansia_muciniphila, Alistipes_shahii, Blautia_obeum, and Roseburia_intestinalis; while, the abundances of Bacteroides coprocola, Bacteroides plebeius, Erysipelatoclostridium ramosum, and Prevotella copri were increased in the non-GDM group. Three of the four species enriched in the non-GDM group manifestied significantly negative correlations with the insulin-signaling pathway and lipopolysaccharide biosynthesis (r ≤ -0.3, adjusted P < 0.05). In the GDM group, Bacteroides vulgatus and Ruminococcus gnavus were significantly and positively correlated with insulin signaling pathway and lipopolysaccharide biosynthesis (r ≤ -0.3, adjusted P < 0.05) among the species enriched from early pregnancy. Virtually all of the species enriched in P2 and P3 were positively correlated with steroid hormone biosynthesis. These results suggest a potential role for the GM in the development of GDM, enabling the potential prevention of GDM by targeting the GM.

Effects of Smartphone-Based Remote Interventions on Dietary Intake, Physical Activity, Weight Control, and Related Health Benefits Among the Older Population With Overweight and Obesity in China: Randomized Controlled Trial.

BACKGROUND: Traditional health management requires many human and material resources and cannot meet the growing needs. Remote medical technology provides an opportunity for health management; however, the research on it is insufficient. OBJECTIVE: The objective of this study was to assess the effects of remote interventions on weight management. METHODS: In this randomized controlled study, 750 participants were randomly assigned to a remote dietary and physical activity intervention group (group DPI), remote physical activity intervention group (group PI), or control group (group C). At baseline (time 1), day 45 (time 2), and day 90 (time 3), data were collected, including data on dietary intake, physical activity, indexes related to weight control, and health benefits. RESULTS: A total of 85.6% (642/750) of participants completed the follow-up. Compared with group C, group DPI showed a significant decrease in energy intake (-581 vs -82 kcal; P<.05), protein intake (-17 vs -3 g; P<.05), fat intake (-8 vs 3 g; P<.05), and carbohydrate intake (-106.5 vs -4.7 g; P<.05) at time 3. Compared with time 1, groups DPI and PI showed a significant decrease in cereal and potato intake (P<.05). Compared with time 1, the physical activity levels related to transportation (group PI: 693 vs 597 metabolic equivalent [MET]-min/week, group C: 693 vs 594 MET-min/week; P<.05) and housework and gardening (group PI: 11 vs 0 MET-min/week, group C: 11 vs 4 MET-min/week; P<.05) in groups PI and C were improved at time 3. Compared with groups PI and C, group DPI showed a significant decrease in weight (-1.56 vs -0.86 kg and -1.56 vs -0.66 kg, respectively; P<.05) and BMI (-0.61 vs -0.33 kg/m2 and -0.61 vs -0.27 kg/m2, respectively; P<.05) at time 2. Compared with groups PI and C, group DPI showed a significant decrease in body weight (-4.11 vs -1.01 kg and -4.11 vs -0.83 kg, respectively; P<.05) and BMI (-1.61 vs -0.40 kg/m2 and -1.61 vs -0.33 kg/m2, respectively; P<.05) at time 3. Compared with group C, group DPI showed a significant decrease in triglyceride (-0.06 vs 0.32 mmol/L; P<.05) at time 2. Compared with groups PI and C, group DPI showed a significant decrease in systolic blood pressure (-8.15 vs -3.04 mmHg and -8.15 vs -3.80 mmHg, respectively; P<.05), triglyceride (-0.48 vs 0.11 mmol/L and -0.48 vs 0.18 mmol/L, respectively; P<.05), and fasting blood glucose (-0.77 vs 0.43 mmol/L and -0.77 vs 0.14 mmol/L, respectively; P<.05). There were significant differences in high-density lipoprotein cholesterol (-0.00 vs -0.07 mmol/L; P<.05) and hemoglobin A1c (-0.19% vs -0.07%; P<.05) between groups DPI and C. CONCLUSIONS: Remote dietary and physical activity interventions can improve dietary intake among participants with overweight and obesity, are beneficial for weight control, and have potential health benefits. TRIAL REGISTRATION: Chinese Clinical Trial Registry ChiCTR1900023355; https://www.chictr.org.cn/showproj.html?proj=38976.

A Study of the Fluid Intake, Hydration Status, and Health Effects among Pregnant Women in Their Second Trimester in China: A Cross-Sectional Study.

The fluid intake and hydration status during pregnancy may influence the health outcomes of both the mother and the fetus. However, there are few studies related to this. The aim of the present study was to investigate fluid intake behaviors among pregnant women in their second trimester, to evaluate their hydration status and pregnancy complications, and to further explore the association of fluid intake and the amniotic fluid index (AFI). Participants' total fluid intake (TFI) levels were determined using a 7-day 24 h fluid intake questionnaire. The levels of water intake from food were not recorded or measured. Morning urine samples were collected, and both urine osmolality levels and urine specific gravity (USG) were tested to evaluate their hydration status. Fasting blood samples were also collected and measured for osmolality and complete blood count (CBC). A total of 324 participants completed the study. They were divided into four groups based on quartiles of TFI, including participants with lower (LFI1 and LFI2) and higher (HFI1 and HFI2) fluid intake levels. The median TFI was 1485 mL, and the median values of the four groups with different TFI levels were 1348, 1449, 1530, and 1609 mL, respectively. Only 3.4% of the participants attained the recommended value following an adequate water intake (1.7 L) level for pregnant women in China. Plain water was the main TFI resource (78.8~100.00%), and differences in the plain water intake levels among the four groups were evident (χ2 = 222.027, p < 0.05). The urine osmolality decreased sequentially with increasing TFI values from the LFI1 to HFI2 group, and significant differences in the urine osmolality levels among the four groups were evident (p < 0.05). Meanwhile, the percentage of dehydrated participants decreased from 26.8% in the LFI1 group to 0.0% in the HFI2 group (χ2 = 131.241, p < 0.05). Participants with higher TFI values had higher AFI values (χ2 = 58.386, all p < 0.05), and moderate-intensity correlations were found between TFI and urine osmolality, hydration status, and AFI (all p < 0.05). A large proportion of the participants had insufficient TFIs during the second trimester of pregnancy, and a proportion of the participants were dehydrated. The preliminary analysis showed that the AFI was correlated with the TFI during the second trimester of pregnancy. A sufficient TFI is necessary for pregnant women to improve their hydration status and may have effects on their health. The results can provide appropriate scientific references for the development of beneficial recommendations concerning adequate water intake levels for pregnant women in China.

The relationship between water intake, hydration biomarkers and physical activity of young male athletes in Beijing, China: A cross-sectional study.

BACKGROUND AND OBJECTIVES: To explore the relationship between water intake, hydration biomarkers and physical activity of young male athletes. METHODS AND STUDY DESIGN: A 7-day cross-sectional study was conducted among 45 male athletes aged 18-25 years in Beijing, China. Total drinking fluids (TDF) was obtained using 7-day 24-h fluid intake questionnaire. Water from food (WFF) was assessed using the methods of food weighing, duplicate portion method and laboratory analysis. Physical activity was evaluated using physical activity energy expenditure (PAEE) and metabolic equivalent of task (MET). RESULTS: Totally, 42 participants completed the study. The medians of total water intake (TWI), TDF and WFF of participants were 2771 mL, 1653 mL and 1088 mL respectively. Jonckheere-Terpstra test showed a significant increase trend toward higher TWI and TDF with higher PAEE level (Z=2.414, p=0.016; Z=2.425, p=0.015). Spearman's rank correlation showed that TWI was positively correlated with PAEE (rs=0.397, p=0.009). TDF showed a positive correlation with PAEE and MET (rs=0.392, p=0.010; rs=0.315, p=0.042). The median urine volume was 840 mL, urine specific gravity was 1.020, and 24-h urine osmolality was 809 mOsm/kg. Significant differences were found in plasma cortisol among the four MET groups (χ2=8.180; p=0.042). CONCLUSIONS: Young male athletes with higher physical activity level had higher amounts of TWI and TDF than their counterparts but had similar hydration biomarkers. There was a high incidence of dehydration in athletes, and attentions need to be paid on the intake of TDF among them to maintain the optimal hydration status.

The Association between the School Environment and Adolescent Alcohol Drinking Behavior in Six Cities in China.

Drinking alcohol during adolescence has short-term and long-term effects on physical and mental health. At this stage, teenagers are greatly influenced by their schoolmates and friends. We conducted a multicenter cross-sectional study to investigate the association between school environment factors and adolescents' drinking behavior in China. Using multistage stratified cluster sampling, the study investigated 27,762 middle school students from six cities in China. The logistic regression model was used to explore the association between the school environment and adolescent alcohol drinking behaviors after adjusting for confounders, including gender, age, city, location, and smoking status. Compared with students with none of their close friends drinking, students with more than half of their close friends drinking were more likely to drink in a year (OR = 20.148, 95% CI: 17.722−22.905, p < 0.001) and in a month (OR = 13.433, 95% CI: 11.779−15.319, p < 0.001). In addition, classmates' drinking behaviors, friends' persuasion, and attending parties were risk factors for adolescents' drinking behavior, while the propaganda and regulations of banning drinking in school were protective factors. The school environment, especially friends drinking, is associated with students' drinking behavior. It is necessary to mobilize the strength of schools and peers to strengthen the prevention and control of adolescent drinking.

The total fluids intake among college students from Hebei Province in spring and summer / 中国学校卫生

Objective@#To analyze the total fluids intake and sources of college students from Hebei in spring and summer, and to provide a scientific reference for appropriate fluids intake in different seasons.@*Methods@#Subjects were recruited in a university in Baoding, Hebei Province, and investigations were conducted in April and June 2021. The number of people who completed both spring and summer investigations was 80. Quantitative instruments and 7 day 24 h Fluid Intake Questionnaire were used to investigate the total drinking fluids, and it was recorded for 7 consecutive days in spring and summer respectively. The duplicate portion method was used to investigate the water from food. The total fluids intake and sources among subjects were analyzed in spring and summer.@*Results@#There was no statistical significance between the total drinking fluids and total fluids intake between spring and summer [1 141(715), 1 176(649)mL/d, (2 496±604)(2 458±554)mL/d] ( F=1.86, 0.59, P >0.05). Spring showed significantly higher water from food compared with summer [(1 318±274)(1 217±302)mL/d]( F=16.63, P <0.05). The proportions of total drinking fluids and water from food in spring were 46% and 54%, respectively, and both were 50% in summer, the differences were statistically significant ( F=12.97, 12.97, P <0.05). There were differences in total fluids intake,total drinking fluids and water from food of different genders in earch season ( t/Z =4.75, -3.63, 3.44; 4.80, -2.91, 4.01, P <0.05). There were differences in total water intake, total drinking fluids, the proportions of total drinking fluids and water from food of different BMI groups in each season ( F/H =8.08, 16.65, 3.03, 3.03; 7.11,17.97, 4.52, 4.52, P <0.05). In spring, only 13.8% of subjects achieved the recommended total drinking fluids of China, compared with 18.8% in summer. In spring and summer, the total fluids intake, total drinking fluids, the proportions of total drinking fluids in the group achieved the recommendation were all higher than those who did not reach the recommendation ( t/Z =6.64, -5.19, 5.79; 8.12, -5.97, 5.70, P <0.05).@*Conclusion@#Season is a factor that affects total fluids intake, and it should be taken into account when setting the recommendation on adequate water intake.

Food intake frequency of senior primary school students in agrecultural and pastoral areas of Qinghai Province / 中国学校卫生

Objective@#To understand the current situation of food intake frequency among schoolage children in agricultural and pastoral areas of Qinghai Province, and to provide a scientific basis for local education departments and schools to formulate scientific nutrition improvement plans and measures.@*Methods@#A multi stage stratified cluster random sampling method was used to select 969 fourth and fifth grade primary school students from 10 primary schools in Hainan Autonomous Prefecture, Haixi Autonomous Prefecture and Haidong City. All the participants were investigated with a questionnaire survey of dietary behaviors.@*Results@#For the fourth and fifth grade primary school students, the highest proportion of "eaten almost every day" were cereal and tuber ( 84.3 %) and fruits (44.6%), and the highest proportion of "barely eaten" was aquatic product (68.1%) and nutritious supplementary (45.9%). The intake of livestock meat and poultry, fishery products, beverages and nutritional supplements of boys was higher than that of girls（ Z =-2.46，-2.46，-2.43，-2.37， P ＜0.05）. The intake of livestock meat and poultry and snacks of fifth grade students was higher than that of fourth grade students, while the intake of fishery products was lower than that of fourth grade students（ Z = -2.66 ，-4.33，-2.65， P ＜0.05）.@*Conclusion@#The frequency of food intake varies among students of differences genders, grades, areas, boarding situation and urbanities. Relevant departments should improve nutrition improvement plans for school age children with different characteristics. Schools and families should carry out nutrition education works to cultivate healthy eating behaviors of students.

Breakfast consumption behaviors of senior primary school students from agricultrual and pastoral areas of Qinghai Province / 中国学校卫生

Objective@#To examine breakfast consumption among primary school students in grades 4 and 5 in Qinghai Province, China, and to provide evidence for nutrition education and intervention strategies.@*Methods@#We used a multistage stratified cluster random sampling method to select the participants. A total of 969 students were selected from 10 primary schools in four counties and districts of three cities, namely Haidong City, Hainan Prefecture and Haixi Prefecture in Qinghai Province. A self rated questionnaire was administered to investigate breakfast consumption.@*Results@#The proportion of students who consumed breakfast 5 to 7 times per week, 3 or 4 times per week, and 1 or 2 times per week were 82.0%, 9.7%, and 6.7%, respectively, while 1.5% never ate breakfast. In descending order, the breakfast food types consumed were cereals and tubers; milk, legumes and nuts; vegetables and fruits; fish and poultry; and meat and eggs (84.1%, 69.8%, 66.8%, and 37.7%, respectively). The proportion of vegetables and fruits in the breakfast of grade 5 students was higher than that of grade 4 students( χ 2=4.81, P = 0.03 ), the proportion of fish, poultry,meat and eggs in county urban areas was higher than that of students in rural( χ 2=6.94, P =0.03), while the proportion of vegetables and fruits in urban areas was lower than that of students in suburban areas( χ 2=53.33, P <0.01). The proportion of breakfast food containing fish,poultry,meat and eggs of boarding students was higher than that of non boarding students( χ 2=41.26, P <0.01), while the proportion of breakfast food containing vegetables and fruits, milk & legumens & nuts was lower than that of non-boarding students( χ 2=21.11, 4.41, P <0.01). A total of 44.8% of students had a poor quality breakfast, and only 16.3% had a good quality breakfast. Moreover, 47.5% of breakfasts were prepared by mothers, followed by the school canteen which prepared 29.9%. Except for students in different grades, there were statistically significant differences in the distribution of breakfast preparers in other groups( P <0.05).@*Conclusion@#In Qinghai Province,breakfast skipping is observed in some senior primary school students, and the quality of breakfast is poor. Diet and nutrition education should be provided for students, parents, and school canteen staff to improve the frequency and nutritional quality of children s breakfasts.

Status of snack behavior of senior primary school students in agricultural and pastoral areas of Qinghai Province / 中国学校卫生

Objective@#To understand the current situation regarding snack food consumption among grade 4 and grade 5 primary school students in agricultural and pastoral areas of Qinghai Province, China, and to provide a scientific basis for nutrition education and intervention strategies.@*Methods@#Multistage stratified cluster random sampling was employed. The research included 969 fourth and fifth grade students were selected from 10 primary schools in four counties and districts of three cities in Haidong City, Hainan Prefecture and Haixi Prefecture in Qinghai Province. The self report questionnaire method was used to investigate the current status regarding snack food consumption in this population.@*Results@#The proportion of students who consumed snack food at home, school and elsewhere were 98.2%, 88.5% and 75.4%, respectively. Male students reported a lower rate of snack consumption at school than female students ( χ 2=9.66). The fifth grade students reported a higher rate of snack consumption at home and other places than the fourth grade students ( χ 2=10.31, 6.77). The reported rate of snack consumption of students in the rural was higher than that in the county( χ 2=6.03,100.53, 24.77). The reported rate of snack consumption of boarding students at home was lower than that of non-boarding students ( χ 2=7.22), while the reported rate of snack consumption at school was higher than that of non-boarding students ( χ 2=9.04）（ P <0.01). The most popular snacks consumed at home included fruits and vegetables, cereals and nuts (76.9%, 67.2%, 63.7%), while the most popular snacks consumed at school were fruits and vegetables, cereals and candies (45.1%, 36.9%, 24.4%). The most popular snacks consumed in other settings included ice cream, candies and beverages(54.7%, 51.6%, 42.9%). The top three reasons for snacking were that snacks were regarded as delicious, healthy/nutritious and clean (76.9%, 65.5% and 59.0%, respectively).@*Conclusion@#Snacking is popular among students, although many snacks are unhealthy. Therefore, there is a need to improve food environments and nutrition education, so as to help students to choose healthy beverages and adopt healthy eating behaviors.

Beverage behaviors of senior primary school students in agricultrual and pastoral areas of Qinghai Province / 中国学校卫生

Objective@#To study the consumption of beverages among senior primary school students in rural and pastoral areas of Qinghai Province, China, in order to provide evidence for the development of nutrition and intervention strategies.@*Methods@#A multi stage stratified cluster random sampling method was employed to select 969 primary school students in grades 4 and 5 from 10 schools in Hainan Autonomous Prefecture, Haixi Autonomous Prefecture and Haidong City. All participants completed a questionnaire survey on daily beverage consumption. The Chi square test was performed to compare differences in reported rates of beverage consumption among students in different groups.@*Results@#The proportion of students who consumed beverages at home, school and elsewhere were 96.9%, 64.5% and 84.9%, respectively. The most popular beverages consumed at home were milk and yogurt ( 63.1 %), tea water (53.0%), and tea drinks (52.4%). The most popular beverages consumed at school were tea(29.8%), milk and yogurt (27.8%) and tea drinks (18.4%), while the most popular beverages consumed in other places were tea drinks ( 42.0 %), carbonated drinks (38.1%) and milk and yogurt (35.0%). The top five reasons for choosing a given beverage were taste delicious (81.2%), nutritious (57.6%),healthy and clean(52.6%),many students like to drink(39.6%),family members often drink(37.7%).@*Conclusion@#The consumption of beverages was popular among students, and sugared beverages represented a large proportion of the beverages consumed. Therefore, there is an urgent need to improve the food environment and provide effective nutrition education for students, so as to encourage the consumption of healthy beverages and cultivate healthy eating behaviors.