ABSTRACT
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.
ABSTRACT
Objective To investigate the incidence of iron overload (liver biopsy tissue Prussian blue staining was positive)in newly diagnosed type 2 diabetic patients (T2DM) and to analyze the SLC40A1 gene (NG_009027.1) mutation in 12 newly diagnosed T2DM with iron overload.Methods 198 patients with newly diagnosed T2DM were collected in our hospital from December 2014 to December 2015.12 of them had elevated ferritin and liver biopsy tissue Prussian blue staining was positive.DNA was extracted from the paraffin section of liver tissue and the exons of SLC40A1 gene were amplified by polymerase chain reaction (PCR).The purified products were sequenced in two directions.Results The incidence of iron overload in these newly diagnosed T2DM patients was about 6%.One point mutation c.663T> C was found on the sixth exon region of SLC40A1 gene in all these 12 T2DM patients with iron overload.It's encoded amino acid did not change (221V>V),meaning a samesense mutation.Conclusion Iron overload has a certain incidence in patients with newly diagnosed T2DM.Iron overload may not due to the mutations in SLC40A1 gene,which need further investigation.