[Sugar-sweetened beverage intakes and age of menarche in Chinese girls in 2004-2015].

OBJECTIVE: To investigate the prospective association between sugar-sweetened beverage intakes and age at menarche among Chinese girls. METHODS: Based on China Health and Nutrition Survey(CHNS) from 2004 to 2015, 293 girls aged 7-16 years with both data on sugar-sweetened beverage intake 1-5 years before menarche and age of menarche were included in the present study. Multivariate linear regression analysis and Logistic regression analysis were used to explore the influence of the sugar-sweetened beverage consumption on menarcheal age of Chinese girls. RESULTS: The median age at menarche of girls was 12 years old. The consumption of sugar-sweetened beverages(SSBs) was 0.5(0.2, 1.0) L/week for sweetened soft drinks, 0.5(0.2, 0.9) L/week for sweetened fruit drinks and 0.6(0.3, 1.3) L/week for total. After adjusting age at baseline, residency, maternal educational, level, energy intake at baseline and body mass index standard deviation score, no significant association was found between sweetened soft drinks, sweetened fruit drinks, total sugar-sweetened beverage intake and age at menarche. CONCLUSION: The intake of sugary beverages may not be prospectively related to the age of menarche among Chinese girls.

Dietary Fat and Polyunsaturated Fatty Acid Intakes during Childhood Are Prospectively Associated with Puberty Timing Independent of Dietary Protein.

Dietary fat and fat quality have been inconsistently associated with puberty timing. The aim of this study was to investigate the prospective associations of dietary fat, saturated fatty acid (SFA), polyunsaturated fatty acid (PUFA), and monounsaturated fatty acid (MUFA) with puberty timing. Using longitudinal data from China Health and Nutrition Survey (CHNS) and Southwest China Childhood Nutrition and Growth (SCCNG) Study, we analyzed dietary data, anthropometric measurements, and potential confounders. Dietary intakes were assessed by 3-day 24-h recalls. Age at Tanner stage 2 for breast/genital development (B2/G2) and age at menarche/voice break (M/VB) were used as puberty development markers. Cox proportional hazard regression models were used to estimate the relevance of dietary intake of total fat, SFA, PUFA, and MUFA on puberty timing. Among 3425 girls and 2495 boys, children with higher intakes of total fat and PUFA were more likely to reach their B2/G2 or M/VB at an earlier age. Associations were not attenuated on additional adjustment for childhood dietary protein intake. However, higher intakes of SFA or MUFA were not independently associated with puberty development. A higher intake of dietary fat and PUFA in prepuberty was associated with earlier puberty timing, which was independent of dietary protein intake.

Comparison of the Diet Photograph Record to Weighed Dietary Record and 24 h Dietary Recall for Estimating Energy and Nutrient Intakes Among Chinese Preschoolers.

This study aimed to assess the relative validity of the diet photograph record (DP) for measuring the energy and nutrient intakes against the weighed dietary record (WD) and the 24 h dietary recall (HR) in the Chinese preschoolers. In this study, 40 preschool children aged 4-6 years and their parents were recruited from a kindergarten in southwest China. Dietary intake of the preschoolers on a same day, as estimated by the DP and the HR were compared with the WD. These three methods were administered by the three group of investigators independently. The mean differences, correlation coefficients, cross-classifications, and weighted κ, as well as the Bland-Altman plots were performed to assess the differences and agreements among the estimates from the DP, the HR, and the WD. For the DP and the HR, the estimates of energy and nutrient intakes were moderate to high correlated with the WD, with the higher coefficients ranging from 0.73 to 0.94 for the DP. Both the methods tended to underestimate the dietary intake, but the differences from the known weights using the DP were significantly smaller than those using the HR. The weighed κ values ranking the preschoolers ranged from 0.48 to 0.80 for the DP and ranged from 0.28 to 0.64 for the HR. Furthermore, the Bland-Altman plots indicated a better agreement between the DP and the WD for estimating energy and nutrient intakes. This DP is a valid tool for measuring energy and nutrient intakes among the preschoolers.

Influence of carbohydrate and fiber intakes on age at menarche in Chinese girls / 中国学校卫生

Objective@#To explore the relationship between premenarchal dietary carbohydrate and dietary fiber intakes and age at menarche in Chinese girls.@*Methods@#Based on dietary and menarcheal information on 750 girls from the Chinese Health and Nutrition Survey, multivariate linear regression models and logistic models were used to analyze the influence of dietary carbohydrate and dietary fiber intakes before menarche onset and age at menarche. Carbohydrate intake was replaced by engergg ratio carbohydrate for a sensitivity analysis.@*Results@#Adjusting for residence, per capita household income, body mass index standard deviation score, and energy intake, higher intake and higher energy ratio of carbohydrate were associated with later age at menarche(P<0.01). Compared to girls at the lowest tertile of carbohydrate intake level, those at the highest tertile had a 0.35 years(2.8%) delay in age at menarche, while 55% decreased[OR(95%CI)=0.45(0.30-0.69)]. Dietary fiber intake was not associated with age at menarche in any model(P>0.2).@*Conclusion@#Girls with higher premenarcheal carbohydrate intake experienced menarche later, while dietary fiber intake was not associated with age at menarche.

Prospective effect of dietary intake of fat on menarche among girls / 中国学校卫生

Objective@#To explore the prospective effect of dietary intake of total fat and fatty acids on menarcheal timing among girls,and to provide a theoretical basis for preventing the early puberty development of Chinese children.@*Methods@#Using the data from 1997-2015 China Health and Nutrition Survey (CHNS), 1 240 girls aged 6-13 with menarche information, baseline dietary survey data and at least one follow up assessment were selected. Cox regression analysis was performed to examine the prospective effect of dietary intake of total fat and fatty acids before menarche on age at menarche.@*Results@#The mean baseline age of the participants was (8.3±1.8). After adjustment for year of birth, residence, household income, dietary energy intake and body mass index Z score at baseline, girls in the highest quartile of intake of total fat and polyunsaturated fatty acid (PUFA) had a 30% and 34% higher probability of experiencing menarche at an earlier age than those in the lowest quartile [ HR(HR 95%CI )=1.30 (1.01~1.68)，1.34(1.05~1.70)]. After adjusting for the confounders, there were no correlations between the intake of saturated fatty acid (SFA) and monounsaturated fatty acid (MUFA) and the onset of menarche [ HR(HR 95%CI )=1.24(0.98~1.58),1.25(0.97~ 1.62 )]( P >0.05).@*Conclusion@#Higher dietary intake of total fat and PUFA before menarche may lead to earlier age at menarche and no correlation between intake of SFA and MUFA before menarche with age at menarche is found among Chinese girls.

Prospective effects of protein and animal foods intake on age at menarche among Chinese girls / 中国学校卫生

Objective@#To investigate the prospective effects of the consumption of protein and animal foods before menarche on the age at menarche among Chinese girls.@*Methods@#This paper was based on the data collected in the China Health and Nutrition Survey(CHNS) from 1997 to 2015. A total of 683 girls aged 6 and over who had completed information on age at menarche, height, weight, per capita annual household income, maternal education level and participated in at least one complete dietary survey within 1 to 4 years before menarche were included. Urban-rural stratified multivariable linear regression model was used to examine the effects of protein and animal foods intake before menarche on Chinese girls age at menarche in urban and rural areas.@*Results@#After adjusted for total energy intake, body mass index standard deviation score and per capita annual household income, the consumption of meat before menarche was negatively associated with the age at menarche among rural Chinese girls(B=-0.003, P=0.00), but not among urban Chinese girls(B=0.002, P>0.05). Total protein, dairy, eggs and aquatic products intake before menarche were not associated with Chinese girls age at menarche in urban and rural areas(B=0.002, -0.001, 0.003, 0.000; 0.001, 0.001, -0.001, -0.003, P>0.05).@*Conclusion@#Higher intake of meat before menarche might lead to earlier menarche onset in rural Chinese girls. The consumption of total protein, dairy, eggs, and aquatic products before menarche did not affect the age at menarche in Chinese girls.